xterm - terminal emulator for X
xterm [-toolkitoption ...] [-option ...] [shell]
The xterm program is a terminal emulator for the X Window System. It
  provides DEC VT102/VT220 and selected features from higher-level terminals
  such as VT320/VT420/VT520 (VTxxx). It also provides Tektronix 4014
  emulation for programs that cannot use the window system directly. If the
  underlying operating system supports terminal resizing capabilities (for
  example, the SIGWINCH signal in systems derived from 4.3BSD), xterm
  will use the facilities to notify programs running in the window whenever it
  is resized.
The VTxxx and Tektronix 4014 terminals each have their own
    window so that you can edit text in one and look at graphics in the other at
    the same time. To maintain the correct aspect ratio (height/width),
    Tektronix graphics will be restricted to the largest box with a 4014's
    aspect ratio that will fit in the window. This box is located in the upper
    left area of the window.
Although both windows may be displayed at the same time, one of
    them is considered the “active” window for receiving keyboard
    input and terminal output. This is the window that contains the text cursor.
    The active window can be chosen through escape sequences, the VT
    Options menu in the VTxxx window, and the Tek Options menu
    in the 4014 window.
Xterm provides usable emulations of related DEC terminals:
  - VT52 emulation is complete.
- VT102 emulation is fairly complete, but does not support autorepeat
      (because that would affect the keyboard used by other X clients).
  
  - Double-size characters are displayed properly if your font server supports
      scalable bitmap fonts.
  - VT220 emulation does not support soft fonts, it is otherwise
    complete.
- VT420 emulation (the default) supports controls for manipulating
      rectangles of characters as well as left/right margins.
  
  - Xterm does not support some other features which are not suitable
      for emulation, e.g., two-sessions.
Terminal database (terminfo (5) or termcap (5))
    entries that work with xterm include
  
  - an optional platform-specific entry (“xterm”),
    
 “xterm”,
 “vt102”,
 “vt100”,
 “ansi” and
 “dumb”
Xterm automatically searches the terminal database in this
    order for these entries and then sets the “TERM” variable (and
    the “TERMCAP” environment variable on a few older systems).
    The alternatives after “xterm” are very old, from the late
    1980s.
VT100 and VT102 emulations are commonly equated, though they
    actually differ. The VT102 provided controls for inserting and deleting
    lines.
Similarly, “ansi” and “vt100” are
    often equated. These are not really the same. For instance, they use
    different controls for scrolling (but xterm supports both). These
    features differ in an “ansi” terminal description from
    xterm:
  - acsc
- 
    
 Pseudo-graphics (line-drawing) uses a different mapping.
- xenl
- 
    
 Xterm wraps text at the right margin using the VT100 “newline
      glitch” behavior.
Because of the wrapping behavior, you would occasionally have to
    repaint the screen when using a text editor with the “ansi”
    description.
You may also use descriptions corresponding to the various
    supported emulations such as “vt220” or “vt420”,
    but should set the terminal emulation level with the decTerminalID
    resource.
On most systems, xterm will use the terminfo database. Some
    older systems use termcap. (The “TERMCAP” environment variable
    is not set if xterm is linked against a terminfo library, since the
    requisite information is not provided by the termcap emulation of terminfo
    libraries).
Many of the special xterm features may be modified under
    program control through a set of escape sequences different from the
    standard VTxxx escape sequences (see Xterm Control
  Sequences).
The Tektronix 4014 emulation is also fairly good. It supports
    12-bit graphics addressing, scaled to the window size. Four different font
    sizes and five different lines types are supported. There is no
    write-through or defocused mode support. The Tektronix text and graphics
    commands are recorded internally by xterm and may be written to a
    file by sending the COPY escape sequence (or through the Tektronix
    menu; see below). The name of the file will be
  
“COPYyyyy-MM-dd.hh:mm:ss”
where yyyy, MM, dd, hh, mm and
    ss are the year, month, day, hour, minute and second when the COPY
    was performed (the file is created in the directory xterm is started
    in, or the home directory for a login xterm).
Not all of the features described in this manual are necessarily
    available in this version of xterm. Some (e.g., the non-VT220
    extensions) are available only if they were compiled in, though the most
    commonly-used are in the default configuration.
Xterm automatically highlights the text cursor when the pointer enters
  the window (selected) and unhighlights it when the pointer leaves the window
  (unselected). If the window is the focus window, then the text cursor is
  highlighted no matter where the pointer is.
In VTxxx mode, there are escape sequences to activate and
    deactivate an alternate screen buffer, which is the same size as the display
    area of the window. When activated, the current screen is saved and replaced
    with the alternate screen. Saving of lines scrolled off the top of the
    window is disabled until the normal screen is restored. The usual terminal
    description for xterm allows the visual editor vi(1) to switch
    to the alternate screen for editing and to restore the screen on exit. A
    popup menu entry makes it simple to switch between the normal and alternate
    screens for cut and paste.
In either VTxxx or Tektronix mode, there are escape
    sequences to change the name of the windows. Additionally, in VTxxx
    mode, xterm implements the window-manipulation control sequences from
    dtterm, such as resizing the window, setting its location on the
    screen.
Xterm allows character-based applications to receive mouse
    events (currently button-press and release events, and button-motion events)
    as keyboard control sequences. See Xterm Control Sequences for
    details.
Because xterm uses the X Toolkit library, it accepts the standard X
  Toolkit command line options. Xterm also accepts many
  application-specific options.
By convention, if an option begins with a “+”
    instead of a “-”, the option is restored to its default
    value.
Most of the xterm options are actually parsed by the X
    Toolkit, which sets resource values, and overrides corresponding
    resource-settings in your X resource files. Xterm provides the X
    Toolkit with a table of options. A few of these are marked, telling the X
    Toolkit to ignore them (-help, -version, -class,
    -e, and -into). After the X Toolkit has parsed the
    command-line parameters, it removes those which it handles, leaving the
    specially-marked parameters for xterm to handle.
These options do not set a resource value, and are handled
    specially:
  - -version
- This causes xterm to print a version number to the standard output,
      and then exit.
- -help
- This causes xterm to print out a verbose message describing its
      options, one per line. The message is written to the standard output.
      After printing the message, xterm exits. Xterm generates
      this message, sorting it and noting whether a
      “-option” or a
      “+option” turns the feature on or off, since
      some features historically have been one or the other. Xterm
      generates a concise help message (multiple options per line) when an
      unknown option is used, e.g.,
    
      
 
 
xterm -z
    
 
  
  - If the logic for a particular option such as logging is not compiled into
      xterm, the help text for that option also is not displayed by the
      -help option.
The -version and -help options are interpreted even
    if xterm cannot open the display, and are useful for testing and
    configuration scripts. Along with -class, they are checked before
    other options. To do this, xterm has its own (much simpler) argument
    parser, along with a table of the X Toolkit's built-in list of options.
Relying upon the X Toolkit to parse the options and associated
    values has the advantages of simplicity and good integration with the X
    resource mechanism. There are a few drawbacks
  - Xterm cannot tell easily whether a resource value was set by one of
      the external resource- or application-defaults files, whether it was set
      using xrdb(1), or if it was set through the -xrm option or
      via some directly relevant command-line option. Xterm sees only the
      end-result: a value supplied when creating its widgets.
- Xterm does not know the order in which particular options and items
      in resource files are evaluated. Rather, it sees all of the values for a
      given widget at the same time. In the design of these options, some are
      deemed more important, and can override other options.
  
  - The X Toolkit uses patterns (constants and wildcards) to match resources.
      Once a particular pattern has been used, it will not modify it. To
      override a given setting, a more-specific pattern must be used, e.g.,
      replacing “*” with “.”. Some poorly-designed
      resource files are too specific to allow the command-line options to
      affect the relevant widget values.
  - •
- In a few cases, the X Toolkit combines its standard options in ways which
      do not work well with xterm. This happens with the color
      (-fg, -bg) and reverse (-rv) options. Xterm
      makes a special case of these and adjusts its sense of
      “reverse” to lessen user surprise.
One parameter (after all options) may be given. That overrides
    xterm's built-in choice of shell program:
  - If the parameter is not a relative path, i.e., beginning with
      “./” or “../”, xterm looks for the file
      in the user's PATH. In either case, this check fails if xterm
      cannot construct an absolute path.
- If that check fails (or if no such parameter is given), xterm next
      checks the “SHELL” variable. If that specifies an executable
      file, xterm will attempt to start that. However, xterm
      additionally checks if it is a valid shell, and will unset
      “SHELL” if it is not.
- If “SHELL” is not set to an executable file, xterm
      tries to use the shell program specified in the user's password file
      entry. As before, xterm verifies if this is a valid shell.
- Finally, if the password file entry does not specify a valid shell,
      xterm uses /bin/sh.
The -e option cannot be used with this parameter since it
    uses all parameters following the option.
Xterm validates shell programs by finding their pathname in
    the text file /etc/shells. It treats the environment variable
    “SHELL” specially because (like “TERM”),
    xterm both reads and updates the variable, and because the program
    started by xterm is not necessarily a shell.
The other options are used to control the appearance and behavior.
    Not all options are necessarily configured into your copy of
  xterm:
  - -132
- Normally, the VT102 DECCOLM escape sequence that switches between 80 and
      132 column mode is ignored. This option causes the DECCOLM escape sequence
      to be recognized, and the xterm window will resize
    appropriately.
- -ah
- This option indicates that xterm should always highlight the text
      cursor. By default, xterm will display a hollow text cursor
      whenever the focus is lost or the pointer leaves the window.
- +ah
- This option indicates that xterm should do text cursor highlighting
      based on focus.
- -ai
- This option disables active icon support if that feature was compiled into
      xterm. This is equivalent to setting the vt100 resource
      activeIcon to “false”.
- +ai
- This option enables active icon support if that feature was compiled into
      xterm. This is equivalent to setting the vt100 resource
      activeIcon to “true”.
- -aw
- This option indicates that auto-wraparound should be allowed, and is
      equivalent to setting the vt100 resource autoWrap to
      “true”.
  
  - Auto-wraparound allows the cursor to automatically wrap to the beginning
      of the next line when it is at the rightmost position of a line and text
      is output.
  - +aw
- This option indicates that auto-wraparound should not be allowed, and is
      equivalent to setting the vt100 resource autoWrap to
      “false”.
- -b number
- This option specifies the size of the inner border (the distance between
      the outer edge of the characters and the window border) in pixels. That is
      the vt100 internalBorder resource. The default is
      “2”.
- -baudrate number
- Set the line-speed, used to test the behavior of applications that use the
      line-speed when optimizing their output to the screen. The default is
      “38400”.
- -bc
- turn on text cursor blinking. This overrides the cursorBlink
      resource.
- +bc
- turn off text cursor blinking. This overrides the cursorBlink
      resource.
- -bcf milliseconds
- set the amount of time text cursor is off when blinking via the
      cursorOffTime resource.
- -bcn milliseconds
- set the amount of time text cursor is on when blinking via the
      cursorOnTime resource.
- -bdc
- Set the vt100 resource colorBDMode to “false”,
      disabling the display of characters with bold attribute as color.
- +bdc
- Set the vt100 resource colorBDMode to “true”,
      enabling the display of characters with bold attribute as color rather
      than bold.
- -cb
- Set the vt100 resource cutToBeginningOfLine to
      “false”.
- +cb
- Set the vt100 resource cutToBeginningOfLine to
      “true”.
- -cc characterclassrange:value[, ...]
- This sets classes indicated by the given ranges for using in selecting by
      words (see CHARACTER CLASSES and the charClass
    resource).
- -cjk_width
- Set the cjkWidth resource to “true”. When turned on,
      characters with East Asian Ambiguous (A) category in UTR 11 have a column
      width of 2. Otherwise, they have a column width of 1. This may be useful
      for some legacy CJK text terminal-based programs assuming box drawings and
      others to have a column width of 2. It also should be turned on when you
      specify a TrueType CJK double-width (bi-width/monospace) font either with
      -fa at the command line or faceName resource. The default is
      “false”
- +cjk_width
- Reset the cjkWidth resource.
- -class string
- This option allows you to override xterm's resource class. Normally
      it is “XTerm”, but can be set to another class such as
      “UXTerm” to override selected resources.
  
  - X Toolkit sets the WM_CLASS property using the instance name and
      this class value.
  - -cm
- This option disables recognition of ANSI color-change escape sequences. It
      sets the colorMode resource to “false”.
- +cm
- This option enables recognition of ANSI color-change escape sequences.
      This is the same as the vt100 resource colorMode.
- -cn
- This option indicates that newlines should not be cut in line-mode
      selections. It sets the cutNewline resource to
      “false”.
- +cn
- This option indicates that newlines should be cut in line-mode selections.
      It sets the cutNewline resource to “true”.
- -cr color
- This option specifies the color to use for text cursor. The default is to
      use the same foreground color that is used for text. It sets the
      cursorColor resource according to the parameter.
- -cu
- This option indicates that xterm should work around a bug in the
      more(1) program that causes it to incorrectly display lines that
      are exactly the width of the window and are followed by a line beginning
      with a tab (the leading tabs are not displayed). This option is so named
      because it was originally thought to be a bug in the curses(3x)
      cursor motion package.
- +cu
- This option indicates that xterm should not work around the
      more(1) bug mentioned above.
- -dc
- This option disables the escape sequence to change dynamic colors: the
      vt100 foreground and background colors, its text cursor color, the pointer
      cursor foreground and background colors, the Tektronix emulator foreground
      and background colors, its text cursor color and highlight color. The
      option sets the dynamicColors option to “false”.
- +dc
- This option enables the escape sequence to change dynamic colors. The
      option sets the dynamicColors option to “true”.
- -e program [ arguments ... ]
- This option specifies the program (and its command line arguments) to be
      run in the xterm window. It also sets the window title and icon
      name to be the basename of the program being executed if neither -T
      nor -n are given on the command line.
  
  - NOTE: This must be the last option on the command line.
  - -en encoding
- This option determines the encoding on which xterm runs. It sets
      the locale resource. Encodings other than UTF-8 are supported by
      using luit. The -lc option should be used instead of
      -en for systems with locale support.
- -fa pattern
- This option sets the pattern for fonts selected from the FreeType library
      if support for that library was compiled into xterm. This
      corresponds to the faceName resource. When a CJK double-width font
      is specified, you also need to turn on the cjkWidth resource.
  
  - If you specify both -fa and the X Toolkit option -fn, the
      -fa setting overrides the latter.
- See also the renderFont resource, which combines with this to
      determine whether FreeType fonts are initially active.
  - -fb font
- This option specifies a font to be used when displaying bold text. It sets
      the boldFont resource.
  
  - This font must be the same height and width as the normal font, otherwise
      it is ignored. If only one of the normal or bold fonts is specified, it
      will be used as the normal font and the bold font will be produced by
      overstriking this font.
- See also the discussion of boldMode and alwaysBoldMode
      resources.
  - -fbb
- This option indicates that xterm should compare normal and bold
      fonts bounding boxes to ensure they are compatible. It sets the
      freeBoldBox resource to “false”.
- +fbb
- This option indicates that xterm should not compare normal and bold
      fonts bounding boxes to ensure they are compatible. It sets the
      freeBoldBox resource to “true”.
- -fbx
- This option indicates that xterm should not assume that the normal
      and bold fonts have VT100 line-drawing characters. If any are missing,
      xterm will draw the characters directly. It sets the
      forceBoxChars resource to “false”.
- +fbx
- This option indicates that xterm should assume that the normal and
      bold fonts have VT100 line-drawing characters. It sets the
      forceBoxChars resource to “true”.
- -fc fontchoice
- Specify the initial font chosen from the font menu. The option value
      corresponds to the initialFont resource.
- -fd pattern
- This option sets the pattern for double-width fonts selected from the
      FreeType library if support for that library was compiled into
      xterm. This corresponds to the faceNameDoublesize
    resource.
- -fi font
- This option sets the font for active icons if that feature was compiled
      into xterm.
  
  - See also the discussion of the iconFont resource.
  - -fs size
- This option sets the pointsize for fonts selected from the FreeType
      library if support for that library was compiled into xterm. This
      corresponds to the faceSize resource.
- -fullscreen
- This option indicates that xterm should ask the window manager to
      let it use the full-screen for display, e.g., without window decorations.
      It sets the fullscreen resource to “true”.
- +fullscreen
- This option indicates that xterm should not ask the window manager
      to let it use the full-screen for display. It sets the fullscreen
      resource to “false”.
- -fw font
- This option specifies the font to be used for displaying wide text. By
      default, it will attempt to use a font twice as wide as the font that will
      be used to draw normal text. If no double-width font is found, it will
      improvise, by stretching the normal font. This corresponds to the
      wideFont resource.
- -fwb font
- This option specifies the font to be used for displaying bold wide text.
      By default, it will attempt to use a font twice as wide as the font that
      will be used to draw bold text. If no double-width font is found, it will
      improvise, by stretching the bold font. This corresponds to the
      wideBoldFont resource.
- -fx font
- This option specifies the font to be used for displaying the preedit
      string in the “OverTheSpot” input method.
  
  - See also the discussion of the ximFont resource.
  - -hc color
- (see -selbg).
- -hf
- This option indicates that HP function key escape codes should be
      generated for function keys. It sets the hpFunctionKeys resource to
      “true”.
- +hf
- This option indicates that HP function key escape codes should not be
      generated for function keys. It sets the hpFunctionKeys resource to
      “false”.
- -hm
- Tells xterm to use highlightTextColor and
      highlightColor to override the reversed foreground/background
      colors in a selection. It sets the highlightColorMode resource to
      “true”.
- +hm
- Tells xterm not to use highlightTextColor and
      highlightColor to override the reversed foreground/background
      colors in a selection. It sets the highlightColorMode resource to
      “false”.
- -hold
- Turn on the hold resource, i.e., xterm will not immediately
      destroy its window when the shell command completes. It will wait until
      you use the window manager to destroy/kill the window, or if you use the
      menu entries that send a signal, e.g., HUP or KILL.
- +hold
- Turn off the hold resource, i.e., xterm will immediately
      destroy its window when the shell command completes.
- -ie
- Turn on the ptyInitialErase resource, i.e., use the
      pseudo-terminal's sense of the stty erase value.
- +ie
- Turn off the ptyInitialErase resource, i.e., set the stty
      erase value using the kb string from the termcap entry as a
      reference, if available.
- -im
- Turn on the useInsertMode resource, which forces use of insert mode
      by adding appropriate entries to the TERMCAP environment variable. (This
      option is ignored on most systems, because TERMCAP is not used).
- +im
- Turn off the useInsertMode resource.
- -into windowId
- Given an X window identifier (an integer, which can be hexadecimal, octal
      or decimal according to whether it begins with "0x",
      "0" or neither), xterm will reparent its top-level shell
      widget to that window. This is used to embed xterm within other
      applications.
  
  - For instance, there are scripts for Tcl/Tk and Gtk which can be used to
      demonstrate the feature. When using Gtk, there is a limitation of that
      toolkit which requires that xterm's allowSendEvents resource
      is enabled.
  - -itc
- Set the vt100 resource colorITMode to “false”,
      disabling the display of characters with italic attribute as color.
- +itc
- Set the vt100 resource colorITMode to “true”,
      enabling the display of characters with italic attribute as color rather
      than italic.
- -j
- This option indicates that xterm should do jump scrolling. It
      corresponds to the jumpScroll resource. Normally, text is scrolled
      one line at a time; this option allows xterm to move multiple lines
      at a time so that it does not fall as far behind. Its use is strongly
      recommended since it makes xterm much faster when scanning through
      large amounts of text. The VT100 escape sequences for enabling and
      disabling smooth scroll as well as the VT Options menu can be used
      to turn this feature on or off.
- +j
- This option indicates that xterm should not do jump scrolling.
- -k8
- This option sets the allowC1Printable resource. When
      allowC1Printable is set, xterm overrides the mapping of C1
      control characters (code 128–159) to treat them as printable.
- +k8
- This option resets the allowC1Printable resource.
- -kt keyboardtype
- This option sets the keyboardType resource. Possible values
      include: “unknown”, “default”,
      “legacy”, “hp”, “sco”,
      “sun”, “tcap” and “vt220”.
  
  - The value “unknown”, causes the corresponding resource to be
      ignored.
- The value “default”, suppresses the associated
    resources
- hpFunctionKeys,
    
 scoFunctionKeys,
 sunFunctionKeys,
 tcapFunctionKeys,
 oldXtermFKeys and
 sunKeyboard,
- using the Sun/PC keyboard layout.
  - -l
- Turn logging on, unless disabled by the logInhibit resource.
  
  - Some versions of xterm may have logging enabled. However, normally
      logging is not supported, due to security concerns in the early 1990s.
      That was a problem in X11R4 xterm (1989) which was addressed by a
      patch to X11R5 late in 1993. X11R6 included these fixes. The older version
      (when running with root privilege) would create the log file using
      root privilege. The reason why xterm ran with root
      privileges was to open pseudo-terminals. Those privileges are now needed
      only on very old systems: Unix98 pseudo-terminals made the BSD scheme
      unnecessary.
- Unless overridden by the -lf option or the logFile
    resource:
  - If the filename is “-”, then logging is sent to the standard
      output.
- Otherwise a filename is generated, and the log file is written to the
      directory from which xterm is invoked.
- The generated filename is of the form
    
      
 
 
XtermLog.XXXXXX
    
 
  
  - or
    
      
 
 
Xterm.log.hostname.yyyy.mm.dd.hh.mm.ss.XXXXXX
    
 
- depending on how xterm was built.
 
  - +l
- Turn logging off.
- -lc
- Turn on support of various encodings according to the users' locale
      setting, i.e., LC_ALL, LC_CTYPE, or LANG environment variables. This is
      achieved by turning on UTF-8 mode and by invoking luit for
      conversion between locale encodings and UTF-8. (luit is not invoked
      in UTF-8 locales.) This corresponds to the locale resource.
  
  - The actual list of encodings which are supported is determined by
      luit. Consult the luit manual page for further details.
- See also the discussion of the -u8 option which supports UTF-8
      locales.
  - +lc
- Turn off support of automatic selection of locale encodings. Conventional
      8bit mode or, in UTF-8 locales or with -u8 option, UTF-8 mode will
      be used.
- -lcc path
- File name for the encoding converter from/to locale encodings and UTF-8
      which is used with -lc option or locale resource. This
      corresponds to the localeFilter resource.
- -leftbar
- Force scrollbar to the left side of VT100 screen. This is the default,
      unless you have set the rightScrollBar resource.
- -lf filename
- Specify the log filename. This sets the logFile resource. If set to
      “-”, xterm writes its log to the standard output. See
      the -l option.
- -ls
- This option indicates that the shell that is started in the xterm
      window will be a login shell (i.e., the first character of argv[0] will be
      a dash, indicating to the shell that it should read the user's .login or
      .profile).
  
  - The -ls flag and the loginShell resource are ignored if
      -e is also given, because xterm does not know how to make
      the shell start the given command after whatever it does when it is a
      login shell - the user's shell of choice need not be a Bourne shell after
      all. Also, xterm -e is supposed to provide a consistent
      functionality for other applications that need to start text-mode programs
      in a window, and if loginShell were not ignored, the result of
      ~/.profile might interfere with that.
- If you do want the effect of -ls and -e simultaneously, you
      may get away with something like
    
      
 
 
xterm -e /bin/bash -l -c "my command here"
    
 
- Finally, -ls is not completely ignored, because
      xterm -ls -e does write a /etc/wtmp entry (if
      configured to do so), whereas xterm -e does not.
  - +ls
- This option indicates that the shell that is started should not be a login
      shell (i.e., it will be a normal “subshell”).
- -maximized
- This option indicates that xterm should ask the window manager to
      maximize its layout on startup. This corresponds to the maximized
      resource.
  
  - Maximizing is not the reverse of iconifying; it is possible to do both
      with certain window managers.
  - +maximized
- This option indicates that xterm should ask the window manager to
      not maximize its layout on startup.
- -mb
- This option indicates that xterm should ring a margin bell when the
      user types near the right end of a line.
- +mb
- This option indicates that margin bell should not be rung.
- -mc milliseconds
- This option specifies the maximum time between multi-click
    selections.
- -mesg
- Turn off the messages resource, i.e., disallow write access to the
      terminal.
- +mesg
- Turn on the messages resource, i.e., allow write access to the
      terminal.
- -mk_width
- Set the mkWidth resource to “true”. This makes
      xterm use a built-in version of the wide-character width
      calculation. The default is “false”
- +mk_width
- Reset the mkWidth resource.
- -ms color
- This option specifies the color to be used for the pointer cursor. The
      default is to use the foreground color. This sets the pointerColor
      resource.
- -nb number
- This option specifies the number of characters from the right end of a
      line at which the margin bell, if enabled, will ring. The default is
      “10”.
- -nul
- This option disables the display of underlining.
- +nul
- This option enables the display of underlining.
- -pc
- This option enables the PC-style use of bold colors (see boldColors
      resource).
- +pc
- This option disables the PC-style use of bold colors.
- -pf font
- This option specifies the font to be used for the pointer. The
      corresponding resource name is pointerFont. The resource value
      default is cursor.
- -pob
- This option indicates that the window should be raised whenever a
      Control-G is received.
- +pob
- This option indicates that the window should not be raised whenever a
      Control-G is received.
- -report-charclass
- Print a report to the standard output showing information about the
      character-classes which can be altered using the charClass
      resource.
- -report-colors
- Print a report to the standard output showing information about colors as
      xterm allocates them. This corresponds to the reportColors
      resource.
- -report-fonts
- Print a report to the standard output showing information about fonts
      which are loaded. This corresponds to the reportFonts
    resource.
- -report-icons
- Print a report to the standard output showing information about
      pixmap-icons which are loaded. This corresponds to the reportIcons
      resource.
- -report-xres
- Print a report to the standard output showing the values of boolean,
      numeric or string X resources for the VT100 widget when initialization is
      complete. This corresponds to the reportXRes resource.
- -rightbar
- Force scrollbar to the right side of VT100 screen.
- -rvc
- This option disables the display of characters with reverse attribute as
      color.
- +rvc
- This option enables the display of characters with reverse attribute as
      color.
- -rw
- This option indicates that reverse-wraparound should be allowed. This
      allows the cursor to back up from the leftmost column of one line to the
      rightmost column of the previous line. This is very useful for editing
      long shell command lines and is encouraged. This option can be turned on
      and off from the VT Options menu.
- +rw
- This option indicates that reverse-wraparound should not be allowed.
- -s
- This option indicates that xterm may scroll asynchronously, meaning
      that the screen does not have to be kept completely up to date while
      scrolling. This allows xterm to run faster when network latencies
      are very high and is typically useful when running across a very large
      internet or many gateways.
- +s
- This option indicates that xterm should scroll synchronously.
- -samename
- Does not send title and icon name change requests when the request would
      have no effect: the name is not changed. This has the advantage of
      preventing flicker and the disadvantage of requiring an extra round trip
      to the server to find out the previous value. In practice this should
      never be a problem.
- +samename
- Always send title and icon name change requests.
- -sb
- This option indicates that some number of lines that are scrolled off the
      top of the window should be saved and that a scrollbar should be displayed
      so that those lines can be viewed. This option may be turned on and off
      from the VT Options menu.
- +sb
- This option indicates that a scrollbar should not be displayed.
- -selbg color
- This option specifies the color to use for the background of selected
      text. If not specified, reverse video is used. See the discussion of the
      highlightColor resource.
- -selfg color
- This option specifies the color to use for selected text. If not
      specified, reverse video is used. See the discussion of the
      highlightTextColor resource.
- -sf
- This option indicates that Sun function key escape codes should be
      generated for function keys.
- +sf
- This option indicates that the standard escape codes should be generated
      for function keys.
- -sh number
- scale line-height values by the given number. See the discussion of the
      scaleHeight resource.
- -si
- This option indicates that output to a window should not automatically
      reposition the screen to the bottom of the scrolling region. This option
      can be turned on and off from the VT Options menu.
- +si
- This option indicates that output to a window should cause it to scroll to
      the bottom.
- -sk
- This option indicates that pressing a key while using the scrollbar to
      review previous lines of text should cause the window to be repositioned
      automatically in the normal position at the bottom of the scroll
    region.
- +sk
- This option indicates that pressing a key while using the scrollbar should
      not cause the window to be repositioned.
- -sl number
- This option specifies the number of lines to save that have been scrolled
      off the top of the screen. This corresponds to the saveLines
      resource. The default is “1024”.
- -sm
- This option, corresponding to the sessionMgt resource, indicates
      that xterm should set up session manager callbacks.
- +sm
- This option indicates that xterm should not set up session manager
      callbacks.
- -sp
- This option indicates that Sun/PC keyboard should be assumed, providing
      mapping for keypad “+” to “,”, and CTRL-F1 to
      F13, CTRL-F2 to F14, etc.
- +sp
- This option indicates that the standard escape codes should be generated
      for keypad and function keys.
- -t
- This option indicates that xterm should start in Tektronix mode,
      rather than in VTxxx mode. Switching between the two windows is
      done using the “Options” menus.
  
  - Terminal database (terminfo (5) or termcap (5)) entries that
      work with xterm are:
- “tek4014”,
    
 “tek4015”,
 “tek4012”,
 “tek4013”,
 “tek4010”, and
 “dumb”.
- Xterm automatically searches the terminal database in this order
      for these entries and then sets the “TERM” variable (and the
      “TERMCAP” environment variable, if relevant).
  - +t
- This option indicates that xterm should start in VTxxx
    mode.
- -tb
- This option, corresponding to the toolBar resource, indicates that
      xterm should display a toolbar (or menubar) at the top of its
      window. The buttons in the toolbar correspond to the popup menus, e.g.,
      control/left/mouse for Main Options.
- +tb
- This option indicates that xterm should not set up a toolbar.
- -ti term_id
- Specify the name used by xterm to select the correct response to
      terminal ID queries. It also specifies the emulation level, used to
      determine the type of response to a DA control sequence. Valid values
      include vt52, vt100, vt101, vt102, vt220, and vt240 (the
      “vt” is optional). The default is “vt420”. The
      term_id argument specifies the terminal ID to use. (This is the
      same as the decTerminalID resource).
- -tm string
- This option specifies a series of terminal setting keywords followed by
      the characters that should be bound to those functions, similar to the
      stty program. The keywords and their values are described in detail
      in the ttyModes resource.
- -tn name
- This option specifies the name of the terminal type to be set in the TERM
      environment variable. It corresponds to the termName resource. This
      terminal type must exist in the terminal database (termcap or terminfo,
      depending on how xterm is built) and should have li# and
      co# entries. If the terminal type is not found, xterm uses
      the built-in list “xterm”, “vt102”, etc.
- -u8
- This option sets the utf8 resource. When utf8 is set,
      xterm interprets incoming data as UTF-8. This sets the
      wideChars resource as a side-effect, but the UTF-8 mode set by this
      option prevents it from being turned off. If you must turn UTF-8 encoding
      on and off, use the -wc option or the corresponding
      wideChars resource, rather than the -u8 option.
  
  - This option and the utf8 resource are overridden by the -lc
      and -en options and locale resource. That is, if
      xterm has been compiled to support luit, and the
      locale resource is not “false” this option is
      ignored. We recommend using the -lc option or the
      “locale: true” resource in UTF-8 locales when
      your operating system supports locale, or -en UTF-8 option
      or the “locale: UTF-8” resource when your
      operating system does not support locale.
  - +u8
- This option resets the utf8 resource.
- -uc
- This option makes the cursor underlined instead of a box.
- +uc
- This option makes the cursor a box instead of underlined.
- -ulc
- This option disables the display of characters with underline attribute as
      color rather than with underlining.
- +ulc
- This option enables the display of characters with underline attribute as
      color rather than with underlining.
- -ulit
- This option, corresponding to the italicULMode resource, disables
      the display of characters with underline attribute as italics rather than
      with underlining.
- +ulit
- This option, corresponding to the italicULMode resource, enables
      the display of characters with underline attribute as italics rather than
      with underlining.
- -ut
- This option indicates that xterm should not write a record into the
      system utmp log file.
- +ut
- This option indicates that xterm should write a record into the
      system utmp log file.
- -vb
- This option indicates that a visual bell is preferred over an audible one.
      Instead of ringing the terminal bell whenever a Control-G is received, the
      window will be flashed.
- +vb
- This option indicates that a visual bell should not be used.
- -wc
- This option sets the wideChars resource.
  
  - When wideChars is set, xterm maintains internal structures
      for 16-bit characters. If xterm is not started in UTF-8 mode (or if
      this resource is not set), initially it maintains those structures to
      support 8-bit characters. Xterm can later be switched, using a menu
      entry or control sequence, causing it to reallocate those structures to
      support 16-bit characters.
- The default is “false”.
  - +wc
- This option resets the wideChars resource.
- -wf
- This option indicates that xterm should wait for the window to be
      mapped the first time before starting the subprocess so that the initial
      terminal size settings and environment variables are correct. It is the
      application's responsibility to catch subsequent terminal size
    changes.
- +wf
- This option indicates that xterm should not wait before starting
      the subprocess.
- -ziconbeep percent
- Same as zIconBeep resource. If percent is non-zero, xterms that
      produce output while iconified will cause an XBell sound at the given
      volume and have “***” prepended to their icon titles. Most
      window managers will detect this change immediately, showing you which
      window has the output. (A similar feature was in x10 xterm.)
- -C
- This option indicates that this window should receive console output. This
      is not supported on all systems. To obtain console output, you must be the
      owner of the console device, and you must have read and write permission
      for it. If you are running X under xdm on the console screen you
      may need to have the session startup and reset programs explicitly change
      the ownership of the console device in order to get this option to
    work.
- -Sccn
- This option allows xterm to be used as an input and output channel
      for an existing program and is sometimes used in specialized applications.
      The option value specifies the last few letters of the name of a
      pseudo-terminal to use in slave mode, plus the number of the inherited
      file descriptor. If the option contains a “/” character,
      that delimits the characters used for the pseudo-terminal name from the
      file descriptor. Otherwise, exactly two characters are used from the
      option for the pseudo-terminal name, the remainder is the file descriptor.
      Examples (the first two are equivalent since the descriptor follows the
      last “/”):
    
      
 
 
-S/dev/pts/123/45
-S123/45
-Sab34
    
 
  
  - Note that xterm does not close any file descriptor which it did not
      open for its own use. It is possible (though probably not portable) to
      have an application which passes an open file descriptor down to
      xterm past the initialization or the -S option to a process
      running in the xterm.
The following command line arguments are provided for compatibility with older
  versions. They may not be supported in the next release as the X Toolkit
  provides standard options that accomplish the same task.
  - %geom
- This option specifies the preferred size and position of the Tektronix
      window. It is shorthand for specifying the
      “tekGeometry” resource.
- #geom
- This option specifies the preferred position of the icon window. It is
      shorthand for specifying the “iconGeometry”
    resource.
- -T string
- This option specifies the title for xterm's windows. It is
      equivalent to -title.
- -n string
- This option specifies the icon name for xterm's windows. It is
      shorthand for specifying the “iconName” resource.
      Note that this is not the same as the toolkit option -name. The
      default icon name is the application name.
  
  - If no suitable icon is found, xterm provides a compiled-in
    pixmap.
- X Toolkit sets the WM_ICON_NAME property using this value.
  - -r
- This option indicates that reverse video should be simulated by swapping
      the foreground and background colors. It is equivalent to -rv.
- -w number
- This option specifies the width in pixels of the border surrounding the
      window. It is equivalent to -borderwidth or -bw.
The following standard X Toolkit command line arguments are commonly used with
  xterm:
  - -bd color
- This option specifies the color to use for the border of the window. The
      corresponding resource name is borderColor. Xterm uses the X
      Toolkit default, which is “XtDefaultForeground”.
  
  - Xterm's VT100 window has two borders: the inner border
      internalBorder and the outer border borderWidth,
      managed by the X Toolkit.
- Normally xterm fills the inner border using the VT100 window's
      background color. If the colorInnerBorder resource is enabled, then
      xterm may fill the inner border using the borderColor
      resource.
  - -bg color
- This option specifies the color to use for the background of the window.
      The corresponding resource name is background. The default is
      “XtDefaultBackground”.
- -bw number
- This option specifies the width in pixels of the border surrounding the
      window.
  
  - This appears to be a legacy of older X releases. It sets the
      borderWidth resource of the shell widget, and may provide advice to
      your window manager to set the thickness of the window frame. Most window
      managers do not use this information. See the -b option, which
      controls the inner border of the xterm window.
  - -display display
- This option specifies the X server to contact; see X(7).
- -fg color
- This option specifies the color to use for displaying text. The
      corresponding resource name is foreground. The default is
      “XtDefaultForeground”.
- -fn font
- This option specifies the font to be used for displaying normal text. The
      corresponding resource name is font. The resource value default is
      fixed.
- -font font
- This is the same as -fn.
- -geometry geometry
- This option specifies the preferred size and position of the VTxxx
      window; see X(7).
  
  - The normal geometry specification can be suffixed with @ followed
      by a Xinerama screen specification; it can be either g for the
      global screen (default), c for the current screen or a screen
      number.
  - -iconic
- 
    
 This option indicates that xterm should ask the window manager to
      start it as an icon rather than as the normal window. The corresponding
      resource name is iconic.
- -name name
- This option specifies the application name under which resources are to be
      obtained, rather than the default executable file name. Name should
      not contain “.” or “*” characters.
- -rv
- This option indicates that reverse video should be simulated by swapping
      the foreground and background colors. The corresponding resource name is
      reverseVideo.
- +rv
- Disable the simulation of reverse video by swapping foreground and
      background colors.
- -title string
- This option specifies the window title string, which may be displayed by
      window managers if the user so chooses. It is shorthand for specifying the
      “title” resource. The default title is the command
      line specified after the -e option, if any, otherwise the
      application name.
  
  - X Toolkit sets the WM_NAME property using this value.
  - -xrm resourcestring
- This option specifies a resource string to be used. This is especially
      useful for setting resources that do not have separate command line
      options.
X Toolkit accepts alternate names for a few of these options,
    e.g.,
  - “-background” for “-bg”
- “-font” for “-fn”
- “-foreground” for “-fg”
Abbreviated options also are supported, e.g.,
    “-v” for “-version.”
Xterm understands all of the core X Toolkit resource names and classes.
  It also uses the X Toolkit resource types (such as booleans, colors, fonts,
  integers, and strings) along with their respective converters. Those resource
  types are not always sufficient:
  - •
- Xterm's resource values may be lists of names. X Toolkit resource
      types do not include lists. Xterm uses a string for the resource,
      and parses it.
  
  - Comma-separated lists of names ignore case.
  - •
- Xterm may defer processing a resource until it is needed. For
      example, font2 through font7 are loaded as needed, to start
      faster. Again, the actual resource type is a string, parsed and used when
      needed.
Application specific resources (e.g.,
    “XTerm.NAME”) follow:
  - backarrowKeyIsErase (class
    BackarrowKeyIsErase)
- Tie the VTxxx backarrowKey and ptyInitialErase
      resources together by setting the DECBKM state according to whether the
      initial erase character is a backspace (8) or delete (127)
      character. A “false” value disables this feature. The
      default is “False”.
  
  - Here are tables showing how the initial settings for
  - backarrowKeyIsErase (BKIE),
- backarrowKey (BK), and
- ptyInitialErase (PIE), along with the
- stty erase character (^H for backspace, ^? for delete)
 
  
  - will affect DECBKM. First, xterm obtains the initial erase
      character:
  - xterm's internal value is ^H
- xterm asks the operating system for the value which stty
      shows
- the ttyModes resource may override erase
- if ptyInitialErase is false, xterm will look in the terminal
      database
 
  
  - Summarizing that as a table:
    
      
        | PIE | stty | termcap | erase |  
       
        | false | ^H | ^H | ^H |  
        | false | ^H | ^? | ^? |  
        | false | ^? | ^H | ^H |  
        | false | ^? | ^? | ^? |  
        | true | ^H | ^H | ^H |  
        | true | ^H | ^? | ^H |  
        | true | ^? | ^H | ^? |  
        | true | ^? | ^? | ^? |  
 
- Using that erase character, xterm allows further
    choices:
  - if backarrowKeyIsErase is true, xterm uses the erase
      character for the initial state of DECBKM
- if backarrowKeyIsErase is false, xterm sets DECBKM to
      2 (internal). This ties together backarrowKey and the control
      sequence for DECBKM.
- applications can send a control sequence to set/reset DECBKM
      control set
- the “Backarrow Key (BS/DEL)” menu entry toggles
      DECBKM
 
  
  - Summarizing the initialization details:
    
      
        | erase | BKIE | BK | DECBKM | result |  
       
        | ^? | false | false | 2 | ^H |  
        | ^? | false | true | 2 | ^? |  
        | ^? | true | false | 0 | ^? |  
        | ^? | true | true | 1 | ^? |  
        | ^H | false | false | 2 | ^H |  
        | ^H | false | true | 2 | ^? |  
        | ^H | true | false | 0 | ^H |  
        | ^H | true | true | 1 | ^H |  
 
  - buffered (class Buffered)
- Normally xterm is built with double-buffer support. This resource
      can be used to turn it on or off. Setting the resource to
      “true” turns double-buffering on. The default value is
      “False”.
- bufferedFPS (class BufferedFPS)
- When xterm is built with double-buffer support, this gives the
      maximum number of frames/second. The default is “40” and is
      limited to the range 1 through 100.
- cursorTheme (class CursorTheme)
- The Xcursor(7) library provides a way to change the pointer shape and
      size. The X11 library uses this library to extend the font- and
      glyph-cursor calls used by applications such as xterm to substitute
      external files for the built-in “core” cursors provided by
      X.
  
  - Xterm uses the pointerShape resource to select the X cursor
      shape. Most of the available sets of cursor themes provide an incomplete
      set of “core” cursors (while possibly adding other cursors).
      Because of this limitation, xterm disables the feature by
    default.
- The cursor theme feature can be useful because X cursors are not scalable
      and on a high-resolution display, the cursors are hard to find. Some of
      the cursor themes include larger cursors to work around this
    limitation:
  - The default core cursors are 8x8 pixels;
- Some cursor themes include cursors up to the X server limit of 64x64
      pixels.
 
  
  - At startup, xterm sets the XCURSOR_THEME environment
      variable to enable or disable the cursor theme feature. The default value
      is “none”. Other values (including “default”)
      are passed to the Xcursor library to select a cursor theme.
  - fullscreen (class Fullscreen)
- Specifies whether or not xterm should ask the window manager to use
      a fullscreen layout on startup. Xterm accepts either a keyword
      (ignoring case) or the number shown in parentheses:
  - false (0)
- Fullscreen layout is not used initially, but may be later via
      menu-selection or control sequence.
- true (1)
- Fullscreen layout is used initially, but may be disabled later via
      menu-selection or control sequence.
- always (2)
- Fullscreen layout is used initially, and cannot be disabled later via
      menu-selection or control sequence.
- never (3)
- Fullscreen layout is not used, and cannot be enabled later via
      menu-selection or control sequence.
 
  
  - The default is “false”.
  - hold (class Hold)
- If true, xterm will not immediately destroy its window when the
      shell command completes. It will wait until you use the window manager to
      destroy/kill the window, or if you use the menu entries that send a
      signal, e.g., HUP or KILL. You may scroll back, select text, etc., to
      perform most graphical operations. Resizing the display will lose data,
      however, since this involves interaction with the shell which is no longer
      running.
- hpFunctionKeys (class HpFunctionKeys)
- Specifies whether or not HP function key escape codes should be generated
      for function keys. The default is “false”, i.e., this
      feature is disabled.
  
  - The keyboardType resource is the preferred mechanism for selecting
      this mode.
  - iconGeometry (class IconGeometry)
- Specifies the preferred size and position of the application when
      iconified. It is not necessarily obeyed by all window managers.
- iconHint (class IconHint)
- Specifies an icon which will be added to the window manager hints.
      Xterm provides no default value.
  
  - Set this resource to “none” to omit the hint entirely, using
      whatever the window manager may decide.
- If the iconHint resource is given (or is set via the -n
      option) xterm searches for a pixmap file with that name, in the
      current directory as well as in /usr/X11R7/include/X11/pixmaps. if the
      resource does not specify an absolute pathname. In each case, xterm
      adds “_48x48” and/or “.xpm” to the filename
      after trying without those suffixes. If it is able to load the file,
      xterm sets the window manager hint for the icon-pixmap. These
      pixmaps are distributed with xterm, and can optionally be
      compiled-in:
  - mini.xterm_16x16, mini.xterm_32x32, mini.xterm_48x48
- filled-xterm_16x16, filled-xterm_32x32, filled-xterm_48x48
- xterm_16x16, xterm_32x32, xterm_48x48
- xterm-color_16x16, xterm-color_32x32, xterm-color_48x48
 
  
  - In either case, xterm allows for adding a “_48x48” to
      specify the largest of the pixmaps as a default. That is,
      “mini.xterm” is the same as
      “mini.xterm_48x48”.
- If no explicit iconHint resource is given (or if none of the
      compiled-in names matches), xterm uses “mini.xterm”
      (which is always compiled-in).
- The iconHint resource has no effect on “desktop”
      files, including “panel” and “menu”. Those are
      typically set via a “.desktop” file; xterm provides
      samples for itself (and the uxterm script). The more capable
      desktop systems allow changing the icon on a per-user basis.
  - iconName (class IconName)
- Specifies a label for xterm when iconified. Xterm provides
      no default value; some window managers may assume the application name,
      e.g., “xterm”.
  
  - Setting the iconName resource sets the icon label unless overridden
      by zIconBeep or the control sequences which change the window and
      icon labels.
  - keyboardType (class KeyboardType)
- Enables one (or none) of the various keyboard-type resources:
      hpFunctionKeys, scoFunctionKeys, sunFunctionKeys,
      tcapFunctionKeys, oldXtermFKeys and sunKeyboard.
  
  - The resource's value should be one of the corresponding strings
      “hp”, “sco”, “sun”,
      “tcap”, “legacy” or “vt220”,
      respectively.
- The individual resources are provided for legacy support; this resource is
      simpler to use. Xterm will use only one keyboard-type, but if
      multiple resources are set, it warns and uses the last one it checks.
- The default is “unknown”, i.e., none of the associated
      resources are set via this resource.
  - maxBufSize (class MaxBufSize)
- Specify the maximum size of the input buffer. The default is
      “32768”. You cannot set this to a value less than the
      minBufSize resource. It will be increased as needed to make that
      value evenly divide this one.
  
  - On some systems you may want to increase one or both of the
      maxBufSize and minBufSize resource values to achieve better
      performance if the operating system prefers larger buffer sizes.
  - maximized (class Maximized)
- Specifies whether or not xterm should ask the window manager to
      maximize its layout on startup. The default is “false”.
- menuHeight (class MenuHeight)
- Specifies the height of the toolbar, which may be increased by the X
      toolkit layout widget depending upon the fontsize used. The default is
      “25”.
- menuLocale (class MenuLocale)
- Specify the locale used for character-set computations when loading the
      popup menus. Use this to improve initialization performance of the Athena
      popup menus, which may load unnecessary (and very large) fonts, e.g., in a
      locale having UTF-8 encoding. The default is “C”
    (POSIX).
  
  - To use the current locale (only useful if you have localized the resource
      settings for the menu entries), set the resource to an empty string.
  - messages (class Messages)
- Specifies whether write access to the terminal is allowed initially. See
      mesg(1). The default is “true”.
- minBufSize (class MinBufSize)
- Specify the minimum size of the input buffer, i.e., the amount of data
      that xterm requests on each read. The default is
      “4096”. You cannot set this to a value less than 64.
- omitTranslation (class OmitTranslation)
- Selectively omit one or more parts of xterm's default translations
      at startup. The resource value is a comma-separated list of keywords,
      which may be abbreviated:
  - default
- ignore (mouse) button-down events which were not handled by other
      translations
- fullscreen
- assigns a key-binding to the fullscreen() action.
- keypress
- assigns keypresses by default to the insert-seven-bit() and
      insert-eight-bit() actions.
- paging
- assigns key bindings to the scroll-back() and scroll-forw()
      actions.
- pointer
- assigns pointer motion and button events to the
      pointer-motion() and pointer-button() actions
    respectively.
- popup-menu
- assigns mouse-buttons with the control modifier to the
    popup-menus.
- reset
- assigns mouse-button 2 with the meta modifier to the
      clear-saved-lines action.
- scroll-lock
- assigns a key-binding to the scroll-lock() action.
- select
- assigns mouse- and keypress-combinations to actions which manipulate the
      selection.
  
  - Xterm also uses these actions to capture mouse button and motion
      events which can be manipulated with the mouse protocol control sequences.
      If the select translations are omitted, then the
      pointer-motion and pointer-button handle these mouse
      protocol control sequences instead.
  - shift-fonts
- assigns key-bindings to larger-vt-font() and
      smaller-vt-font() actions.
- wheel-mouse
- assigns buttons 4 and 5 with different modifiers to the
      scroll-back() and scroll-forw() actions.
 
  - ptyHandshake (class PtyHandshake)
- If “true”, xterm will perform handshaking during
      initialization to ensure that the parent and child processes update the
      utmp and stty state.
  
  - See also waitForMap which waits for the pseudo-terminal's notion of
      the screen size, and ptySttySize which resets the screen size after
      other terminal initialization is complete. The default is
      “true”.
  - ptyInitialErase (class PtyInitialErase)
- If “true”, xterm will use the pseudo-terminal's sense
      of the stty erase value. If “false”, xterm
      will set the stty erase value to match its own configuration, using
      the kb string from the termcap entry as a reference, if
    available.
  
  - In either case, the result is applied to the TERMCAP variable which
      xterm sets, if the system uses TERMCAP.
- See also the ttyModes resource, which may override this. The
      default is “False”.
  - ptySttySize (class PtySttySize)
- If “true”, xterm will reset the screen size after
      terminal initialization is complete. This is needed for some systems whose
      pseudo-terminals cannot propagate terminal characteristics. Where it is
      not needed, it can interfere with other methods for setting the initial
      screen size, e.g., via window manager interaction.
  
  - See also waitForMap which waits for a handshake-message giving the
      pseudo-terminal's notion of the screen size. The default is
      “false” on Linux and macOS systems, “true”
      otherwise.
  - reportColors (class ReportColors)
- If true, xterm will print to the standard output a summary of
      colors as it allocates them. The default is “false”.
- reportFonts (class ReportFonts)
- If true, xterm will print to the standard output a summary of each
      font's metrics (size, number of glyphs, etc.), as it loads them. The
      default is “false”.
- reportIcons (class ReportIcons)
- If true, xterm will print to the standard output a summary of each
      pixmap icon as it loads them. The default is “false”.
- reportXRes (class ReportXRes)
- If true, xterm will print to the standard output a list of the
      boolean, numeric and string X resources for the VT100 widget after
      initialization. The default is “false”.
- sameName (class SameName)
- If the value of this resource is “true”, xterm does
      not send title and icon name change requests when the request would have
      no effect: the name is not changed. This has the advantage of preventing
      flicker and the disadvantage of requiring an extra round trip to the
      server to find out the previous value. In practice this should never be a
      problem. The default is “true”.
- scaleHeight (class ScaleHeight)
- Scale line-height values by the resource value, which is limited to
      “0.9” to “1.5”. The default value is
      “1.0”,
  
  - While this resource applies to either bitmap or TrueType fonts, its main
      purpose is to help work around incompatible changes in the Xft library's
      font metrics. Xterm checks the font metrics to find what the
      library claims are the bounding boxes for each glyph (character). However,
      some of Xft's features (such as the autohinter) can cause the glyphs to be
      scaled larger than the bounding boxes, and be partly overwritten by the
      next row.
- See useClipping for a related resource.
  - scoFunctionKeys (class ScoFunctionKeys)
- Specifies whether or not SCO function key escape codes should be generated
      for function keys. The default is “false”, i.e., this
      feature is disabled.
  
  - The keyboardType resource is the preferred mechanism for selecting
      this mode.
  - sessionMgt (class SessionMgt)
- If the value of this resource is “true”, xterm sets
      up session manager callbacks for XtNdieCallback and
      XtNsaveCallback. The default is “true”.
- sunFunctionKeys (class SunFunctionKeys)
- Specifies whether or not Sun function key escape codes should be generated
      for function keys. The default is “false”, i.e., this
      feature is disabled.
  
  - The keyboardType resource is the preferred mechanism for selecting
      this mode.
  - sunKeyboard (class SunKeyboard)
- Xterm translates certain key symbols based on its assumptions about
      your keyboard. This resource specifies whether or not Sun/PC keyboard
      layout (i.e., the PC keyboard's numeric keypad together with 12 function
      keys) should be assumed rather than DEC VT220. This causes the keypad
      “+” to be mapped to “,”. and CTRL F1-F10 to
      F11-F20, depending on the setting of the ctrlFKeys resource, so
      xterm emulates a DEC VT220 more accurately. Otherwise (the default,
      with sunKeyboard set to “false”), xterm uses
      PC-style bindings for the function keys and keypad.
  
  - PC-style bindings use the Shift, Alt, Control and Meta keys as modifiers
      for function-keys and keypad (see Xterm Control Sequences for
      details). The PC-style bindings are analogous to PCTerm, but not the same
      thing. Normally these bindings do not conflict with the use of the Meta
      key as described for the eightBitInput resource. If they do, note
      that the PC-style bindings are evaluated first.
- See also the keyboardType resource.
  - tcapFunctionKeys (class TcapFunctionKeys)
- Specifies whether or not function key escape codes read from the
      termcap/terminfo entry corresponding to the TERM environment
      variable should be generated for function keys instead of those configured
      using sunKeyboard and keyboardType. The default is
      “false”, i.e., this feature is disabled.
  
  - The keyboardType resource is the preferred mechanism for selecting
      this mode.
  - termName (class TermName)
- Specifies the terminal type name to be set in the TERM environment
      variable.
- title (class Title)
- Specifies a string that may be used by the window manager when displaying
      this application.
- toolBar (class ToolBar)
- Specifies whether or not the toolbar should be displayed. The default is
      “true”.
- ttyModes (class TtyModes)
- Specifies a string containing terminal setting keywords. Except where
      noted, they may be bound to characters. Other keywords set
      modes. Not all keywords are supported on a given system. Allowable
      keywords include:
    
      
        | Keyword | POSIX? | Notes |  
       
        | brk | no | CHAR may send an “interrupt” signal, as well as
          ending the input-line. |  
        | dsusp | no | CHAR will send a terminal “stop” signal after
          input is flushed. |  
        | eof | yes | CHAR will terminate input (i.e., an end of file). |  
        | eol | yes | CHAR will end the line. |  
        | eol2 | no | alternate CHAR for ending the line. |  
        | erase | yes | CHAR will erase the last character typed. |  
        | erase2 | no | alternate CHAR for erasing the last input-character. |  
        | flush | no | CHAR will cause output to be discarded until another
          flush character is typed. |  
        | intr | yes | CHAR will send an “interrupt” signal. |  
        | kill | yes | CHAR will erase the current line. |  
        | lnext | no | CHAR will enter the next character quoted. |  
        | quit | yes | CHAR will send a “quit” signal. |  
        | rprnt | no | CHAR will redraw the current line. |  
        | start | yes | CHAR will restart the output after stopping it. |  
        | status | no | CHAR will cause a system-generated status line to be
          printed. |  
        | stop | yes | CHAR will stop the output. |  
        | susp | yes | CHAR will send a terminal “stop” signal |  
        | swtch | no | CHAR will switch to a different shell layer. |  
        | tabs | yes | Mode disables tab-expansion. |  
        | -tabs | yes | Mode enables tab-expansion. |  
        | weras | no | CHAR will erase the last word typed. |  
 
  
  - Control characters may be specified as ^char (e.g., ^c or ^u) and
      ^? may be used to indicate delete (127). Use ^- to denote
      undef. Use \034 to represent ^\, since a literal
      backslash in an X resource escapes the next character.
- This is very useful for overriding the default terminal settings without
      having to run stty every time an xterm is started. Note,
      however, that the stty program on a given host may use different
      keywords; xterm's table is built in. The POSIX column in the
      table indicates which keywords are supported by a standard stty
      program.
- If the ttyModes resource specifies a value for erase, that
      overrides the ptyInitialErase resource setting, i.e., xterm
      initializes the terminal to match that value.
  - useInsertMode (class UseInsertMode)
- Force use of insert mode by adding appropriate entries to the TERMCAP
      environment variable. This is useful if the system termcap is broken.
      (This resource is ignored on most systems, because TERMCAP is not used).
      The default is “false”.
- utmpDisplayId (class UtmpDisplayId)
- Specifies whether or not xterm should try to record the display
      identifier (display number and screen number) as well as the hostname in
      the system utmp log file. The default is “true”.
- utmpInhibit (class UtmpInhibit)
- Specifies whether or not xterm should try to record the user's
      terminal in the system utmp log file. If true, xterm will
      not try. The default is “false”.
- validShells (class ValidShells)
- Augment (add to) the system's /etc/shells, when determining whether
      to set the “SHELL” environment variable when running a given
      program.
  
  - The resource value is a list of lines (separated by newlines). Each line
      holds one pathname. Xterm ignores any line beginning with
      “#” after trimming leading/trailing whitespace from each
      line.
- The default is an empty string.
  - waitForMap (class WaitForMap)
- Specifies whether or not xterm should wait for the initial window
      map before starting the subprocess. This is part of the
      ptyHandshake logic. When xterm is directed to wait in this
      fashion, it passes the terminal size from the display end of the
      pseudo-terminal to the terminal I/O connection, e.g., using the size
      according to the window manager. Otherwise, it uses the size as given in
      resource values or command-line option -geometry. The default is
      “false”.
- zIconBeep (class ZIconBeep)
- Same as -ziconbeep command line argument. If the value of this resource is
      non-zero, xterms that produce output while iconified will cause an XBell
      sound at the given volume and have “*** ” prepended
      to their icon titles. Most window managers will detect this change
      immediately, showing you which window has the output. (A similar feature
      was in x10 xterm.) The default is “false”.
- zIconTitleFormat (class ZIconTitleFormat)
- Allow customization of the string used in the zIconBeep feature.
      The default value is “*** %s”.
  
  - If the resource value contains a “%s”, then xterm
      inserts the icon title at that point rather than prepending the string to
      the icon title. (Only the first “%s” is used).
The following resources are specified as part of the vt100 widget (class
  VT100). They are specified by patterns such as
  “XTerm.vt100. NAME”.If your xterm is configured to support the
    “toolbar”, then those patterns need an extra level for the
    form-widget which holds the toolbar and vt100 widget. A wildcard between the
    top-level “XTerm” and the “vt100” widget makes
    the resource settings work for either, e.g.,
    “XTerm*vt100.NAME”.
  - activeIcon (class ActiveIcon)
- Specifies whether or not active icon windows are to be used when the
      xterm window is iconified, if this feature is compiled into
      xterm. The active icon is a miniature representation of the content
      of the window and will update as the content changes. Not all window
      managers necessarily support application icon windows. Some window
      managers will allow you to enter keystrokes into the active icon window.
      The default is “default”.
  
  - Xterm accepts either a keyword (ignoring case) or the number shown
      in parentheses:
  - false (0)
- No active icon is shown.
- true (1)
- The active icon is shown. If you are using twm, use this setting to
      enable active-icons.
- default (2)
- Xterm checks at startup, and shows an active icon only for window
      managers which it can identify and which are known to support the feature.
      These are fvwm (full support), and window maker (limited). A
      few other windows managers (such as twm and ctwm) support
      active icons, but do not support the extensions which allow xterm
      to identify the window manager.
 
  - allowBoldFonts (class AllowBoldFonts)
- When set to “false”, xterm will not use bold fonts.
      This overrides both the alwaysBoldMode and the boldMode
      resources.
- allowC1Printable (class AllowC1Printable)
- If true, overrides the mapping of C1 controls (codes 128–159) to
      make them be treated as if they were printable characters. Although this
      corresponds to no particular standard, some users insist it is a VT100.
      The default is “false”.
- allowColorOps (class AllowColorOps)
- Specifies whether control sequences that set/query the dynamic colors
      should be allowed. ANSI colors are unaffected by this resource setting.
      The default is “true”.
- allowFontOps (class AllowFontOps)
- Specifies whether control sequences that set/query the font should be
      allowed. The default is “true”.
- allowMouseOps (class AllowMouseOps)
- Specifies whether control sequences that enable xterm to send
      escape sequences to the host on mouse-clicks and movement. The default is
      “true”.
- allowPasteControls (class
    AllowPasteControls)
- If true, allow control characters such as BEL and CAN to be pasted.
      Formatting characters (tab, newline) are always allowed. Other C0 control
      characters are suppressed unless this resource is enabled. The exact set
      of control characters (C0 and C1) depends upon whether UTF-8 encoding is
      used, as well as the allowC1Printable resource. The default is
      “false”.
- allowScrollLock (class AllowScrollLock)
- Specifies whether control sequences that set/query the Scroll Lock key
      should be allowed, as well as whether the Scroll Lock key responds to
      user's keypress. The default is “false”.
  
  - When this feature is enabled, xterm will sense the state of the
      Scroll Lock key each time it acquires focus. Pressing the Scroll Lock key
      toggles xterm's internal state, as well as toggling the associated
      LED. While the Scroll Lock is active, xterm attempts to keep a
      viewport on the same set of lines. If the current viewport is scrolled
      past the limit set by the saveLines resource, then Scroll Lock has
      no further effect.
- The reason for setting the default to “false” is to avoid
      user surprise. This key is generally unused in keyboard configurations,
      and has not acquired a standard meaning even when it is used in that
      manner. Consequently, users have assigned it for ad hoc purposes.
- See also the autoScrollLock resource.
  - allowSendEvents (class AllowSendEvents)
- Specifies whether or not synthetic key and button events (generated using
      the X protocol SendEvent request) should be interpreted or discarded. The
      default is “false” meaning they are discarded. Note that
      allowing such events would create a very large security hole, therefore
      enabling this resource forcefully disables the
      allowXXXOps resources. The default is
      “false”.
- allowTcapOps (class AllowTcapOps)
- Specifies whether control sequences that query the terminal's notion of
      its function-key strings, as termcap or terminfo capabilities should be
      allowed. The default is “true”.
  
  - A few programs, e.g., vim, use this feature to get an accurate
      description of the terminal's capabilities, independent of the
      termcap/terminfo setting:
  - Xterm can tell the querying program how many colors it supports.
      This is a constant, depending on how it is compiled, typically 16. It does
      not change if you alter resource settings, e.g., the boldColors
      resource.
- Xterm can tell the querying program what strings are sent by
      modified (shift-, control-, alt-) function- and keypad-keys. Reporting
      control- and alt-modifiers is a feature that relies on the ncurses
      extended naming.
 
  - allowTitleOps (class AllowTitleOps)
- Specifies whether control sequences that modify the window title or icon
      name should be allowed. The default is “true”.
- allowWindowOps (class AllowWindowOps)
- Specifies whether extended window control sequences (as used in
      dtterm) should be allowed. These include several control sequences
      which manipulate the window size or position, as well as reporting these
      values and the title or icon name. Each of these can be abused in a
      script; curiously enough most terminal emulators that implement these
      restrict only a small part of the repertoire. For fine-tuning, see
      disallowedWindowOps. The default is “false”.
- altIsNotMeta (class AltIsNotMeta)
- If “true”, treat the Alt-key as if it were the Meta-key.
      Your keyboard may happen to be configured so they are the same. But if
      they are not, this allows you to use the same prefix- and shifting
      operations with the Alt-key as with the Meta-key. See
      altSendsEscape and metaSendsEscape. The default is
      “false”.
- altSendsEscape (class AltSendsEscape)
- This is an additional keyboard operation that may be processed after the
      logic for metaSendsEscape. It is only available if the
      altIsNotMeta resource is set.
  - If “true”, Alt characters (a character combined with the
      modifier associated with left/right Alt-keys) are converted into a
      two-character sequence with the character itself preceded by ESC. This
      applies as well to function key control sequences, unless xterm
      sees that Alt is used in your key translations.
- If “false”, Alt characters input from the keyboard cause a
      shift to 8-bit characters (just like metaSendsEscape). By combining
      the Alt- and Meta-modifiers, you can create corresponding combinations of
      ESC-prefix and 8-bit characters.
 
  
  - The default is “False”. Xterm provides a menu option
      for toggling this resource.
  - alternateScroll (class ScrollCond)
- If “true”, the scroll-back and scroll-forw
      actions send cursor-up and -down keys when xterm is displaying the
      alternate screen. The default is “false”.
  
  - The alternateScroll state can also be set using a control
    sequence.
  - alwaysBoldMode (class AlwaysBoldMode)
- Specifies whether xterm should check if the normal and bold fonts
      are distinct before deciding whether to use overstriking to simulate bold
      fonts. If this resource is true, xterm does not make the check for
      distinct fonts when deciding how to handle the boldMode resource.
      The default is “false”.
    
      
        | boldMode | alwaysBoldMode | Comparison | Action |  
       
        | false | false | ignored | use font |  
        | false | true | ignored | use font |  
        | true | false | same | overstrike |  
        | true | false | different | use font |  
        | true | true | ignored | overstrike |  
 
This resource is used only for bitmap fonts:
  - When using bitmap fonts, it is possible that the font server will
      approximate the bold font by rescaling it from a different font size than
      expected. The alwaysBoldMode resource allows the user to override
      the (sometimes poor) resulting bold font with overstriking (which is at
      least consistent).
- The problem does not occur with TrueType fonts (though there can be other
      unnecessary issues such as different coverage of the normal and bold
      fonts).
 
  
  - As an alternative, setting the allowBoldFonts resource to false
      overrides both the alwaysBoldMode and the boldMode
      resources.
  - alwaysHighlight (class AlwaysHighlight)
- Specifies whether or not xterm should always display a highlighted
      text cursor. By default (if this resource is false), a hollow text cursor
      is displayed whenever the pointer moves out of the window or the window
      loses the input focus. The default is “false”.
- alwaysUseMods (class AlwaysUseMods)
- Override the numLock resource, telling xterm to use the Alt
      and Meta modifiers to construct parameters for function key sequences even
      if those modifiers appear in the translations resource. Normally
      xterm checks if Alt or Meta is used in a translation that would
      conflict with function key modifiers, and will ignore these modifiers in
      that special case. The default is “false”.
- answerbackString (class AnswerbackString)
- Specifies the string that xterm sends in response to an ENQ
      (control/E) character from the host. The default is a blank string, i.e.,
      “”. A hardware VT100 implements this feature as a setup
      option.
- appcursorDefault (class AppcursorDefault)
- If “true”, the cursor keys are initially in application
      mode. This is the same as the VT102 private DECCKM mode, The default is
      “false”.
- appkeypadDefault (class AppkeypadDefault)
- If “true”, the keypad keys are initially in application
      mode. The default is “false”.
- assumeAllChars (class AssumeAllChars)
- If “true”, this enables a special case in bitmap fonts to
      allow the font server to choose how to display missing glyphs. The default
      is “true”.
  
  - The reason for this resource is to help with certain quasi-automatically
      generated fonts (such as the ISO-10646-1 encoding of Terminus) which have
      incorrect font-metrics.
  - autoScrollLock (class AutoScrollLock)
- If “true”, xterm will maintain its viewport of
      displayed lines whenever displaying scrollback, as if
      allowScrollLock were enabled and the Scroll Lock key had been
      pressed. The default is “false”. This feature is only useful
      if the scrollTtyOutput resource is set to
    “false”.
- autoWrap (class AutoWrap)
- Specifies whether or not auto-wraparound should be enabled. This is the
      same as the VT102 DECAWM. The default is “true”.
- awaitInput (class AwaitInput)
- Specifies whether or not xterm uses a 50 millisecond timeout to
      await input (i.e., to support the Xaw3d arrow scrollbar). The default is
      “false”.
- backarrowKey (class BackarrowKey)
- Specifies whether the backarrow key transmits a backspace (8) or delete
      (127) character. This corresponds to the DECBKM control sequence. A
      “true” value specifies backspace. The default is
      “True”. Pressing the control key toggles this behavior.
- background (class Background)
- Specifies the color to use for the background of the window. The default
      is “XtDefaultBackground”.
- bellIsUrgent (class BellIsUrgent)
- Specifies whether to set the Urgency hint for the window manager when
      making a bell sound. The default is “false”.
- bellOnReset (class BellOnReset)
- Specifies whether to sound a bell when doing a hard reset. The default is
      “true”.
- bellSuppressTime (class BellSuppressTime)
- Number of milliseconds after a bell command is sent during which
      additional bells will be suppressed. Default is 200. If set non-zero,
      additional bells will also be suppressed until the server reports that
      processing of the first bell has been completed; this feature is most
      useful with the visible bell.
- boldColors (class ColorMode)
- Specifies whether to combine bold attribute with colors like the IBM PC,
      i.e., map colors 0 through 7 to colors 8 through 15. These normally are
      the brighter versions of the first 8 colors, hence bold. The default is
      “true”.
- boldFont (class BoldFont)
- Specifies the name of the bold font to use instead of overstriking. There
      is no default for this resource.
  
  - This font must be the same height and width as the normal font, otherwise
      it is ignored. If only one of the normal or bold fonts is specified, it
      will be used as the normal font and the bold font will be produced by
      overstriking this font.
- See also the discussion of boldMode and alwaysBoldMode
      resources.
  - boldMode (class BoldMode)
- This specifies whether or not text with the bold attribute should be
      overstruck to simulate bold fonts if the resolved bold font is the same as
      the normal font. It may be desirable to disable bold fonts when color is
      being used for the bold attribute.
  
  - Note that xterm has one bold font which you may set explicitly.
      Xterm attempts to derive a bold font for the other font selections
      (font1 through font7). If it cannot find a bold font, it
      will use the normal font. In each case (whether the explicit resource or
      the derived font), if the normal and bold fonts are distinct, this
      resource has no effect. The default is “true”.
- See the alwaysBoldMode resource which can modify the behavior of
      this resource.
- Although xterm attempts to derive a bold font for other font
      selections, the font server may not cooperate. Since X11R6, bitmap fonts
      have been scaled. The font server claims to provide the bold font that
      xterm requests, but the result is not always readable. XFree86
      introduced a feature which can be used to suppress the scaling. In the X
      server's configuration file (e.g., “/etc/X11/XFree86” or
      “/etc/X11/xorg.conf”), you can add “:unscaled”
      to the end of the directory specification for the “misc”
      fonts, which comprise the fixed-pitch fonts that are used by xterm.
      For example
    
      
 
 
FontPath	"/usr/lib/X11/fonts/misc/"
    
 
- would become
    
      
 
 
FontPath	"/usr/lib/X11/fonts/misc/:unscaled"
    
 
- Depending on your configuration, the font server may have its own
      configuration file. The same “:unscaled” can be added to its
      configuration file at the end of the directory specification for
      “misc”.
- The bitmap scaling feature is also used by xterm to implement VT102
      double-width and double-height characters.
  - brokenLinuxOSC (class BrokenLinuxOSC)
- If true, xterm applies a workaround to ignore malformed control
      sequences that a Linux script might send. Compare the palette control
      sequences documented in console_codes with ECMA-48. The default is
      “true”.
- brokenSelections (class BrokenSelections)
- If true, xterm in 8-bit mode will interpret STRING
      selections as carrying text in the current locale's encoding. Normally
      STRING selections carry ISO-8859-1 encoded text. Setting this
      resource to “true” violates the ICCCM; it may, however, be
      useful for interacting with some broken X clients. The default is
      “false”.
- brokenStringTerm (class BrokenStringTerm)
- provides a work-around for some ISDN routers which start an application
      control string without completing it. Set this to “true” if
      xterm appears to freeze when connecting. The default is
      “false”.
  
  - Xterm's state parser recognizes several types of control strings
      which can contain text, e.g.,
    
  
APC (Application Program Command),
DCS (Device Control String),
OSC (Operating System Command),
PM (Privacy Message), and
SOS (Start of String),
  
  - Each should end with a string-terminator (a special character which cannot
      appear in these strings). Ordinary control characters found within the
      string are not ignored; they are processed without interfering with the
      process of accumulating the control string's content. Xterm
      recognizes these controls in all modes, although some of the functions may
      be suppressed after parsing the control.
- When enabled, this feature allows the user to exit from an unterminated
      control string when any of these ordinary control characters are found:
    
  
control/D (used as an end of file in many shells),
control/H (backspace),
control/I (tab-feed),
control/J (line feed aka newline),
control/K (vertical tab),
control/L (form feed),
control/M (carriage return),
control/N (shift-out),
control/O (shift-in),
control/Q (XOFF),
control/X (cancel)
  - c132 (class C132)
- Specifies whether or not the VT102 DECCOLM escape sequence, used to switch
      between 80 and 132 columns, should be honored. The default is
      “false”.
- cacheDoublesize (class CacheDoublesize)
- Tells whether to cache double-sized fonts by xterm. Set this to
      zero to disable double-sized fonts altogether.
- cdXtraScroll (class CdXtraScroll)
- Specifies whether xterm should scroll to a new page when clearing
      the whole screen. Like tiXtraScroll, the intent of this option is
      to provide a picture of the full-screen application's display on the
      scrollback before wiping out the text.
  
  - Xterm accepts either a keyword (ignoring case) or the number shown
      in parentheses:
  - false (0)
- nothing is added to the scrollback.
- true (1)
- the current screen is added to the scrollback.
- trim (2)
- the current screen is added to the scrollback, but repeated blank lines
      are trimmed (reduced to a single blank line).
 
  
  - The default for this resource is “false”.
  - charClass (class CharClass)
- Specifies comma-separated lists of character class bindings of the form
    
      
 
 
low[-high][:value].
    
 
  
  - These are used in determining which sets of characters should be treated
      the same when doing cut and paste. See the CHARACTER CLASSES
      section.
  - checksumExtension (class
    ChecksumExtension)
- DEC VT420 and up support a control sequence DECRQCRA which reports
      the checksum of the characters in a rectangle. Xterm supports this,
      with extensions that can be configured with bits of the
      checksumExtension:
  - 0
- do not negate the result.
- 1
- do not report the VT100 video attributes.
- 2
- do not omit checksum for blanks.
- 3
- omit checksum for cells not explicitly initialized.
- 4
- do not mask cell value to 8 bits or ignore combining characters.
- 5
- do not mask cell value to 7 bits.
 
  
  - With the default value (0), xterm matches the behavior of DEC's
      terminals. To use all extensions, set all bits, “-1” for
      example.
  - cjkWidth (class CjkWidth)
- Specifies whether xterm should follow the traditional East Asian
      width convention. When turned on, characters with East Asian Ambiguous (A)
      category in UTR 11 have a column width of 2. You may have to set this
      option to “true” if you have some old East Asian terminal
      based programs that assume that line-drawing characters have a column
      width of 2. If this resource is false, the mkWidth resource
      controls the choice between the system's wcwidth and xterm's
      built-in tables. The default is “false”.
- color0 (class Color0)
- color1 (class Color1)
- color2 (class Color2)
- color3 (class Color3)
- color4 (class Color4)
- color5 (class Color5)
- color6 (class Color6)
- color7 (class Color7)
- These specify the colors for the ISO-6429 extension. The defaults are,
      respectively, black, red3, green3, yellow3, a customizable dark blue,
      magenta3, cyan3, and gray90. The default shades of color are chosen to
      allow the colors 8–15 to be used as brighter versions.
- color8 (class Color8)
- color9 (class Color9)
- color10 (class Color10)
- color11 (class Color11)
- color12 (class Color12)
- color13 (class Color13)
- color14 (class Color14)
- color15 (class Color15)
- These specify the colors for the ISO-6429 extension if the bold attribute
      is also enabled. The default resource values are respectively, gray50,
      red, green, yellow, a customized light blue, magenta, cyan, and
    white.
- color16 (class Color16)
- through
- color255 (class Color255)
- These specify the colors for the 256-color extension. The default resource
      values are for
  - colors 16 through 231 to make a 6x6x6 color cube, and
- colors 232 through 255 to make a grayscale ramp.
 
  
  - Resources past color15 are available as a compile-time option. Due
      to a hardcoded limit in the X libraries on the total number of resources
      (to 400), the resources for 256-colors are omitted when wide-character
      support and luit are enabled. Besides inconsistent behavior if only
      part of the resources were allowed, determining the exact cutoff is
      difficult, and the X libraries tend to crash if the number of resources
      exceeds the limit. The color palette is still initialized to the same
      default values, and can be modified via control sequences.
- On the other hand, the resource limit does permit including the entire
      range for 88-colors.
  - colorAttrMode (class ColorAttrMode)
- Specifies whether colorBD, colorBL, colorRV, and
      colorUL should override ANSI colors. If not, these are displayed
      only when no ANSI colors have been set for the corresponding position. The
      default is “false”.
- colorBD (class ColorBD)
- This specifies the color to use to display bold characters if the
      “colorBDMode” resource is enabled. The default is
      “XtDefaultForeground”.
  
  - See also the veryBoldColors resource which allows combining bold
      and color.
  - colorBDMode (class ColorAttrMode)
- Specifies whether characters with the bold attribute should be displayed
      in color or as bold characters. Note that setting colorMode off
      disables all colors, including bold. The default is
    “false”.
- colorBL (class ColorBL)
- This specifies the color to use to display blink characters if the
      “colorBLMode” resource is enabled. The default is
      “XtDefaultForeground”.
  
  - See also the veryBoldColors resource which allows combining
      underline and color.
  - colorBLMode (class ColorAttrMode)
- Specifies whether characters with the blink attribute should be displayed
      in color. Note that setting colorMode off disables all colors,
      including this. The default is “false”.
- colorIT (class ColorIT)
- This specifies the color to use to display italic characters if the
      “colorITMode” resource is enabled. The default is
      “XtDefaultForeground”.
  
  - See also the veryBoldColors resource which allows combining
      attributes and color.
  - colorITMode (class ColorAttrMode)
- Specifies whether characters with the italic attribute should be displayed
      in color or as italic characters. The default is
    “false”.
  
  - Note that:
  - Setting colorMode off disables all colors, including italic.
- The italicULMode resource overrides colorITMode.
 
  - colorInnerBorder (class ColorInnerBorder)
- Normally, xterm fills the VT100 window's inner border using the
      background color.
  
  - If the colorInnerBorder resource is enabled, at startup
      xterm will compare the borderColor and the window's
      background color. If those are different, xterm will use the
      borderColor resource to fill the inner border. Otherwise, it will
      use the window's background color.
- The default is “false”.
  - colorMode (class ColorMode)
- Specifies whether or not recognition of ANSI (ISO-6429) color change
      escape sequences should be enabled. The default is
    “true”.
- colorRV (class ColorRV)
- This specifies the color to use to display reverse characters if the
      “colorRVMode” resource is enabled. The default is
      “XtDefaultForeground”.
  
  - See also the veryBoldColors resource which allows combining reverse
      and color.
  - colorRVMode (class ColorAttrMode)
- Specifies whether characters with the reverse attribute should be
      displayed in color. Note that setting colorMode off disables all
      colors, including this. The default is “false”.
- colorUL (class ColorUL)
- This specifies the color to use to display underlined characters if the
      “colorULMode” resource is enabled. The default is
      “XtDefaultForeground”.
  
  - See also the veryBoldColors resource which allows combining
      underline and color.
  - colorULMode (class ColorAttrMode)
- Specifies whether characters with the underline attribute should be
      displayed in color or as underlined characters. Note that setting
      colorMode off disables all colors, including underlining. The
      default is “false”.
- combiningChars (class CombiningChars)
- Specifies the number of wide-characters which can be stored in a cell to
      overstrike (combine) with the base character of the cell. This can be set
      to values in the range 0 to 5. The default is “2”.
- ctrlFKeys (class CtrlFKeys)
- In VT220 keyboard mode (see sunKeyboard resource), specifies the
      amount by which to shift F1-F12 given a control modifier (CTRL). This
      allows you to generate key symbols for F10-F20 on a Sun/PC keyboard. The
      default is “10”, which means that CTRL F1 generates the key
      symbol for F11.
- curses (class Curses)
- Specifies whether or not the last column bug in more(1) should be
      worked around. See the -cu option for details. The default is
      “false”.
- cursorBlink (class CursorBlink)
- Specifies whether to make the cursor blink. Xterm accepts either a
      keyword (ignoring case) or the number shown in parentheses:
  - false (0)
- The cursor will not blink, but may be combined with escape sequences
      according to the cursorBlinkXOR resource.
- true (1)
- The cursor will blink, but may be combined with escape sequences according
      to the cursorBlinkXOR resource.
- always (2)
- The cursor will always blink, ignoring escape sequences. The menu entry
      will be disabled.
- never (3)
- The cursor will never blink, ignoring escape sequences. The menu entry
      will be disabled.
 
  
  - The default is “false”.
  - cursorBlinkXOR (class CursorBlinkXOR)
- Xterm uses two inputs to determine whether the cursor blinks:
  - The cursorBlink resource (which can be altered with a menu
    entry).
- Control sequences (private mode 12 and DECSCUSR).
 
  
  - The cursorBlinkXOR resource determines how those inputs are
      combined:
  - false
- 
    
 Xterm uses the logical-OR of the two variables. If either is set,
      xterm makes the cursor blink.
- true
- 
    
 Xterm uses the logical-XOR of the two variables. If only one is set,
      xterm makes the cursor blink.
 
  
  - The default is “true”.
  - cursorColor (class CursorColor)
- Specifies the color to use for the text cursor. The default is
      “XtDefaultForeground”. By default, xterm attempts to
      keep this color from being the same as the background color, since it
      draws the cursor by filling the background of a text cell. The same
      restriction applies to control sequences which may change this color.
  
  - Setting this resource overrides most of xterm's adjustments to
      cursor color. It will still use reverse-video to disallow some cases, such
      as a black cursor on a black background.
  - cursorOffTime (class CursorOffTime)
- Specifies the duration of the “off” part of the cursor blink
      cycle-time in milliseconds. The same timer is used for text blinking. The
      default is “300”.
- cursorOnTime (class CursorOnTime)
- Specifies the duration of the “on” part of the cursor blink
      cycle-time, in milliseconds. The same timer is used for text blinking. The
      default is “600”.
- cursorUnderLine (class CursorUnderLine)
- Specifies whether to make the cursor underlined or a box. The default is
      “false”.
- cutNewline (class CutNewline)
- If “false”, triple clicking to select a line does not
      include the newline at the end of the line. If
      “true”, the Newline is selected. The default is
      “true”.
- cutToBeginningOfLine (class
    CutToBeginningOfLine)
- If “false”, triple clicking to select a line selects only
      from the current word forward. If “true”, the entire line is
      selected. The default is “true”.
- decGraphicsID (class DecGraphicsID)
- Allows a way to combine the graphics feature from certain DEC terminals
      (125, 240, 241, 330, 340 or 382) with other emulation levels which did not
      provide the graphics feature. As in decTerminalID, leading
      non-digit characters are ignored, e.g., “vt340” and
      “340” are the same.
  
  - If the resource value is nonzero, xterm uses that emulation level
      when initializing the drawing region and decoding control sequences to
      draw graphics.
- The default is “0”.
  - decTerminalID (class DecTerminalID)
- Specifies the emulation level (100=VT100, 220=VT220, etc.), used to
      determine the type of response to a DA control sequence. Leading non-digit
      characters are ignored, e.g., “vt100” and
      “100” are the same. The default is “420”.
- defaultString (class DefaultString)
- Specify the character (or string) which xterm will substitute when
      pasted text includes a character which cannot be represented in the
      current encoding. For instance, pasting UTF-8 text into a display of
      ISO-8859-1 characters will only be able to display codes 0–255,
      while UTF-8 text can include Unicode values above 255. The default is
      “#” (a single pound sign).
  
  - If the undisplayable text would be double-width, xterm will add a
      space after the “#” character, to give roughly the same
      layout on the screen as the original text.
  - deleteIsDEL (class DeleteIsDEL)
- Specifies what the Delete key on the editing keypad should send
      when pressed. The resource value is a string, evaluated as a boolean after
      startup. Xterm uses it in conjunction with the keyboardType
      resource:
  - If the keyboard type is “default”, or “vt220”
      and the resource is either “true” or “maybe”
      send the VT220-style Remove escape sequence. Otherwise, send DEL
      (127).
- If the keyboard type is “legacy”, and the resource is
      “true” send DEL. Otherwise, send the Remove
    sequence.
- Otherwise, if the keyboard type is none of these special cases, send DEL
      (127).
 
  
  - The default is “Maybe”. The resource is allowed to be a
      non-boolean “maybe” so that the popup menu Delete is
      DEL entry does not override the keyboard type.
  - directColor (class DirectColor)
- Specifies whether to handle direct-color control sequences using the X
      server's available colors, or to approximate those using a color map with
      256 entries. A “true” value enables the former. The default
      is “true”.
- disallowedColorOps (class
    DisallowedColorOps)
- Specify which features will be disabled if allowColorOps is false.
      This is a comma-separated list of names. The default value is
SetColor,GetColor,GetAnsiColor
  
  - The names are listed below. Xterm ignores capitalization, but they
      are shown in mixed-case for clarity.
  - SetColor
- Set a specific dynamic color.
- GetColor
- Report the current setting of a given dynamic color.
- GetAnsiColor
- Report the current setting of a given ANSI color (actually any of the
      colors set via ANSI-style controls).
 
  - disallowedFontOps (class
    DisallowedFontOps)
- Specify which features will be disabled if allowFontOps is false.
      This is a comma-separated list of names. The default value is
    
      
 
 
SetFont,GetFont
    
 
  
  - The names are listed below. Xterm ignores capitalization, but they
      are shown in mixed-case for clarity.
  - SetFont
- Set the specified font.
- GetFont
- Report the specified font.
 
  - disallowedMouseOps (class
    DisallowedMouseOps)
- Specify which features will be disabled if allowMouseOps is false.
      This is a comma-separated list of names. The default value is
      “*” which matches all names. The names are listed below.
      Xterm ignores capitalization, but they are shown in mixed-case for
      clarity.
  - X10
- The original X10 mouse protocol.
- Locator
- DEC locator mode
- VT200Click
- X11 mouse-clicks only.
- VT200Hilite
- X11 mouse-clicks and highlighting.
- AnyButton
- XFree86 xterm any-button mode sends button-clicks as well as motion
      events while the button is pressed.
- AnyEvent
- XFree86 xterm any-event mode sends button-clicks as well as motion
      events whether or not a button is pressed.
- FocusEvent
- Send FocusIn/FocusOut events.
- Extended
- The first extension beyond X11 mouse protocol, this encodes the
      coordinates in UTF-8. It is deprecated in favor of SGR, but
      provided for compatibility.
- SGR
- This is the recommended extension for mouse-coordinates
- URXVT
- Like Extended, this is provided for compatibility.
- AlternateScroll
- This overrides the alternateScroll resource.
 
  - disallowedPasteControls (class
    DisallowedPasteControls)
- The allowPasteControls resource is normally used to prevent pasting
      C1 controls, as well as non-formatting C0 controls such as the ASCII
      escape character. Those characters are simply ignored. This resource
      further extends the set of control characters which cannot be pasted,
      converting each into a space.
  
  - The resource value is a comma-separated list of names. Xterm
      ignores capitalization. The default value is
    
      
 
 
BS,DEL,ENQ,EOT,ESC,NUL
    
 
- The names are listed below:
  - C0
- all ASCII control characters.
- Individual C0 characters
- NUL, SOH, STX, ETX, EOT, ENQ, ACK, BEL, BS, HT, LF, VT, FF, CR, SO, SI,
      DLE, DC1, DC2, DC3, DC4, NAK, SYN, ETB, CAN, EM, SUB, ESC, FS, GS, RS,
    US
- DEL
- ASCII delete
- NL
- ASCII line-feed, i.e., “newline” is the same as LF.
 
  - disallowedTcapOps (class
    DisallowedTcapOps)
- Specify which features will be disabled if allowTcapOps is false.
      This is a comma-separated list of names. The default value is
    
      
 
 
SetTcap,GetTcap
    
 
  
  - The names are listed below. Xterm ignores capitalization, but they
      are shown in mixed-case for clarity.
  - SetTcap
- (not implemented)
- GetTcap
- Report specified function- and other special keys.
 
  - disallowedWindowOps (class
    DisallowedWindowOps)
- Specify which features will be disabled if allowWindowOps is false.
      This is a comma-separated list of names, or (for the controls adapted from
      dtterm the operation number). The default value is
    
      
 
 
20,21,SetXprop,SetSelection
(i.e., all except a few “dangerous” operations are allowed).
    
 
  
  - The names are listed below. Xterm ignores capitalization, but they
      are shown in mixed-case for clarity. Where a number can be used as an
      alternative, it is given in parentheses after the name.
  - GetChecksum
- Report checksum of characters in a rectangular region.
- GetIconTitle (20)
- Report xterm window's icon label as a string.
- GetScreenSizeChars (19)
- Report the size of the screen in characters as numbers.
- GetSelection
- Report selection data as a base64 string.
- GetWinPosition (13)
- Report xterm window position as numbers.
- GetWinSizeChars (18)
- Report the size of the text area in characters as numbers.
- GetWinSizePixels (14)
- Report xterm window in pixels as numbers.
- GetWinState (11)
- Report xterm window state as a number.
- GetWinTitle (21)
- Report xterm window's title as a string.
- LowerWin (6)
- Lower the xterm window to the bottom of the stacking order.
- MaximizeWin (9)
- Maximize window (i.e., resize to screen size).
- FullscreenWin (10)
- Use full screen (i.e., resize to screen size, without window
    decorations).
- MinimizeWin (2)
- Iconify window.
- PopTitle (23)
- Pop title from internal stack.
- PushTitle (22)
- Push title to internal stack.
- RaiseWin (5)
- Raise the xterm window to the front of the stacking order.
- RefreshWin (7)
- Refresh the xterm window.
- RestoreWin (1)
- De-iconify window.
- SetChecksum
- Modify algorithm for reporting checksum of characters in a rectangular
      region.
- SetSelection
- Set selection data.
- SetWinLines
- Resize to a given number of lines, at least 24.
- SetWinPosition (3)
- Move window to given coordinates.
- SetWinSizeChars (8)
- Resize the text area to given size in characters.
- SetWinSizePixels (4)
- Resize the xterm window to given size in pixels.
- SetXprop
- Set X property on top-level window.
 
  - dynamicColors (class DynamicColors)
- Specifies whether or not escape sequences to change colors assigned to
      different attributes are recognized.
- eightBitControl (class EightBitControl)
- Specifies whether or not control sequences sent by the terminal should be
      eight-bit characters or escape sequences. The default is
      “false”.
- eightBitInput (class EightBitInput)
- If “true”, Meta characters (a single-byte character combined
      with the Meta modifier key) input from the keyboard are presented
      as a single character, modified according to the eightBitMeta
      resource. If “false”, Meta characters are converted into a
      two-character sequence with the character itself preceded by ESC. The
      default is “true”.
  
  - The metaSendsEscape and altSendsEscape resources may
      override this feature. Generally keyboards do not have a key labeled
      “Meta”, but “Alt” keys are common, and they
      are conventionally used for “Meta”. If they were synonymous,
      it would have been reasonable to name this resource
      “altSendsEscape”, reversing its sense. For more
      background on this, see the meta(3x) function in curses.
- Note that the Alt key is not necessarily the same as the
      Meta modifier. The xmodmap utility lists your key modifiers.
      X defines modifiers for shift, (caps) lock and control, as well as 5
      additional modifiers which are generally used to configure key modifiers.
      Xterm inspects the same information to find the modifier associated
      with either Meta key (left or right), and uses that key as the
      Meta modifier. It also looks for the NumLock key, to recognize the
      modifier which is associated with that.
- If your xmodmap configuration uses the same keycodes for Alt- and
      Meta-keys, xterm will only see the Alt-key definitions, since those
      are tested before Meta-keys. NumLock is tested first. It is important to
      keep these keys distinct; otherwise some of xterm's functionality
      is not available.
- The eightBitInput resource is tested at startup time. If
      “true”, the xterm tries to put the terminal into
      8-bit mode. If “false”, on startup, xterm tries to
      put the terminal into 7-bit mode. For some configurations this is
      unsuccessful; failure is ignored. After startup, xterm does not
      change the terminal between 8-bit and 7-bit mode.
- As originally implemented in X11, the resource value did not change after
      startup. However (since patch #216 in 2006) xterm can modify
      eightBitInput after startup via a control sequence. The
      corresponding terminfo capabilities smm (set meta mode) and
      rmm (reset meta mode) have been recognized by bash for some
      time. Interestingly enough, bash's notion of “meta
      mode” differs from the standard definition (in the terminfo
      manual), which describes the change to the eighth bit of a character. It
      happens that bash views “meta mode” as the ESC
      character that xterm puts before a character when a special meta
      key is pressed. bash's early documentation talks about the ESC
      character and ignores the eighth bit.
  - eightBitMeta (class EightBitMeta)
- This controls the way xterm modifies the eighth bit of a
      single-byte key when the eightBitInput resource is set. The default
      is “locale”.
  
  - The resource value is a string, evaluated as a boolean after startup.
  - false
- The key is sent unmodified.
- locale
- The key is modified only if the locale uses eight-bit encoding.
- true
- The key is sent modified.
- never
- The key is always sent unmodified.
 
  
  - Except for the never choice, xterm honors the terminfo
      capabilities smm (set meta mode) and rmm (reset meta mode),
      allowing the feature to be turned on or off dynamically.
- If eightBitMeta is enabled when the locale uses UTF-8, xterm
      encodes the value as UTF-8 (since patch #183 in 2003).
  - eightBitOutput (class EightBitOutput)
- Specifies whether or not eight-bit characters sent from the host should be
      accepted as is or stripped when printed. The default is
      “true”, which means that they are accepted as is.
- eightBitSelectTypes (class
    EightBitSelectTypes)
- Override xterm's default selection target list (see
      SELECT/PASTE) for selections in normal (ISO-8859-1) mode. The
      default is an empty string, i.e., “”, which does not
      override anything.
- eraseSavedLines (class EraseSavedLines)
- Specifies whether or not to allow xterm extended ED/DECSED control
      sequences to erase the saved-line buffer. The default is
      “true”.
- faceName (class FaceName)
- Specify the pattern for scalable fonts selected from the FreeType library
      if support for that library was compiled into xterm. There is no
      default value.
  
  - One or more fonts can be specified, separated by commas. If prefixed with
      “x:” or “x11:” the specification applies to
      the XLFD font resource. A “xft:” prefix is accepted
      but unnecessary since a missing prefix for faceName means that it
      will be used for TrueType. For example,
    
      
 
 
XTerm*faceName: x:fixed,xft:Bitstream Vera Sans Mono
    
 
- If no faceName resource is specified, or if there is no match for
      both TrueType normal and bold fonts, xterm uses the XLFD (bitmap)
      font and related resources.
- It is possible to select suitable bitmap fonts using a script such as
      this:
    
      
 
 
#!/bin/sh
FONT=`xfontsel -print`
test -n "$FONT" && xfd -fn "$FONT"
    
 
- However (even though xfd accepts a “-fa”
      option to denote FreeType fonts), xfontsel has not been similarly
      extended. As a workaround, you may try
    
      
 
 
fc-list :scalable=true:spacing=mono: family
    
 
- to find a list of scalable fixed-pitch fonts which may be used for the
      faceName resource value.
  - faceNameDoublesize (class
    FaceNameDoublesize)
- Specify a double-width scalable font for cases where an application
      requires this, e.g., in CJK applications. There is no default value.
  
  - Like the faceName resource, this allows one or more comma-separated
      font specifications to be applied to the wide TrueType or XLFD
      fonts.
- If the application uses double-wide characters and this resource is not
      given, xterm will use a scaled version of the font given by
      faceName.
  - faceSize (class FaceSize)
- Specify the pointsize for fonts selected from the FreeType library if
      support for that library was compiled into xterm. The default is
      “8.0” On the VT Fonts menu, this corresponds
      to the Default entry.
  
  - Although the default is “8.0”, this may not be the same as
      the pointsize for the default bitmap font, i.e., that assigned with the
      -fn option, or the font resource. The default value of
      faceSize is chosen to match the size of the “fixed”
      font, making switching between bitmap and TrueType fonts via the font menu
      give comparable sizes for the window. If your -fn option uses a
      different pointsize, you might want to adjust the faceSize resource
      to match.
- You can specify the pointsize for TrueType fonts selected with the other
      size-related menu entries such as Medium, Huge, etc., by using one of the
      following resource values. If you do not specify a value, they default to
      “0.0”, which causes xterm to use the ratio of font
      sizes from the corresponding bitmap font resources to obtain a TrueType
      pointsize.
- If all of the faceSize resources are set, then xterm will
      use this information to determine the next smaller/larger TrueType font
      for the larger-vt-font() and smaller-vt-font() actions. If
      any are not set, xterm will use only the areas of the bitmap
    fonts.
  - faceSize1 (class FaceSize1)
- Specifies the pointsize of the first alternative font.
- faceSize2 (class FaceSize2)
- Specifies the pointsize of the second alternative font.
- faceSize3 (class FaceSize3)
- Specifies the pointsize of the third alternative font.
- faceSize4 (class FaceSize4)
- Specifies the pointsize of the fourth alternative font.
- faceSize5 (class FaceSize5)
- Specifies the pointsize of the fifth alternative font.
- faceSize6 (class FaceSize6)
- Specifies the pointsize of the sixth alternative font.
- faceSize7 (class FaceSize7)
- Specifies the pointsize of the seventh alternative font.
- fastScroll (class FastScroll)
- Modifies the effect of jump scroll (jumpScroll) by suppressing
      screen refreshes for the special case when output to the screen has
      completely shifted the contents off-screen. For instance, cat'ing a
      large file to the screen does this.
- font (class Font)
- Specifies the name of the normal font. The default is
      “fixed”.
  
  - See the discussion of the locale resource, which describes how this
      font may be overridden.
- NOTE: some resource files use patterns such as
    
      
 
 
*font: fixed
    
 
- which are overly broad, affecting both
    
      
 
 
xterm.vt100.font
    
 
- and
    
      
 
 
xterm.vt100.utf8Fonts.font
    
 
- which is probably not what you intended.
  - font1 (class Font1)
- Specifies the name of the first alternative font, corresponding to
      “Unreadable” in the standard menu.
- font2 (class Font2)
- Specifies the name of the second alternative font, corresponding to
      “Tiny” in the standard menu.
- font3 (class Font3)
- Specifies the name of the third alternative font, corresponding to
      “Small” in the standard menu.
- font4 (class Font4)
- Specifies the name of the fourth alternative font, corresponding to
      “Medium” in the standard menu.
- font5 (class Font5)
- Specifies the name of the fifth alternative font, corresponding to
      “Large” in the standard menu.
- font6 (class Font6)
- Specifies the name of the sixth alternative font, corresponding to
      “Huge” in the standard menu.
- font7 (class Font7)
- Specifies the name of the seventh alternative font, corresponding to
      “Enormous” in the standard menu.
- fontDoublesize (class FontDoublesize)
- Specifies whether xterm should attempt to use font scaling to draw
      double-sized characters. Some older font servers cannot do this properly,
      will return misleading font metrics. The default is “true”.
      If disabled, xterm will simulate double-sized characters by drawing
      normal characters with spaces between them.
- fontWarnings (class FontWarnings)
- Specify whether xterm should report an error if it fails to load a
      font:
  - 0
- Never report an error (though the X libraries may).
- 1
- Report an error if the font name was given as a resource setting.
- 2
- Always report an error on failure to load a font.
 
  
  - The default is “1”.
  - forceBoxChars (class ForceBoxChars)
- Specifies whether xterm should assume the normal and bold fonts
      have VT100 line-drawing characters:
  - The fixed-pitch ISO-8859-*-encoded fonts used by xterm normally
      have the VT100 line-drawing glyphs in cells 1–31. Other fixed-pitch
      fonts may be more attractive, but lack these glyphs.
- When using an ISO-10646-1 font and the wideChars resource is true,
      xterm uses the Unicode glyphs which match the VT100 line-drawing
      glyphs.
 
  
  - If “false”, xterm checks for missing glyphs in the
      font and makes line-drawing characters directly as needed. If
      “true”, xterm assumes the font does not contain the
      line-drawing characters, and draws them directly. The default is
      “false”.
- The VT100 line-drawing character set (also known as the DEC Special
      Character and Line Drawing Set) is shown in this table. It includes a
      few special characters which are not used for drawing lines:
    
      
        | Cell | Unicode | Description |  
       
        | 0 | U+25AE | black vertical rectangle |  
        | 1 | U+25C6 | black diamond |  
        | 2 | U+2592 | medium shade |  
        | 3 | U+2409 | symbol for horizontal tabulation |  
        | 4 | U+240C | symbol for form feed |  
        | 5 | U+240D | symbol for carriage return |  
        | 6 | U+240A | symbol for line feed |  
        | 7 | U+00B0 | degree sign |  
        | 8 | U+00B1 | plus-minus sign |  
        | 9 | U+2424 | symbol for newline |  
        | 10 | U+240B | symbol for vertical tabulation |  
        | 11 | U+2518 | box drawings light up and left |  
        | 12 | U+2510 | box drawings light down and left |  
        | 13 | U+250C | box drawings light down and right |  
        | 14 | U+2514 | box drawings light up and right |  
        | 15 | U+253C | box drawings light vertical and horizontal |  
        | 16 | U+23BA | box drawings scan 1 |  
        | 17 | U+23BB | box drawings scan 3 |  
        | 18 | U+2500 | box drawings light horizontal |  
        | 19 | U+23BC | box drawings scan 7 |  
        | 20 | U+23BD | box drawings scan 9 |  
        | 21 | U+251C | box drawings light vertical and right |  
        | 22 | U+2524 | box drawings light vertical and left |  
        | 23 | U+2534 | box drawings light up and horizontal |  
        | 24 | U+252C | box drawings light down and horizontal |  
        | 25 | U+2502 | box drawings light vertical |  
        | 26 | U+2264 | less-than or equal to |  
        | 27 | U+2265 | greater-than or equal to |  
        | 28 | U+03C0 | greek small letter pi |  
        | 29 | U+2260 | not equal to |  
        | 30 | U+00A3 | pound sign |  
        | 31 | U+00B7 | middle dot |  
 
  - forcePackedFont (class ForcePackedFont)
- Specifies whether xterm should use the maximum or minimum glyph
      width when displaying using a bitmap font. Use the maximum width to help
      with proportional fonts. The default is “true”, denoting the
      minimum width.
- forceXftHeight (class ForceXftHeight)
- Specifies whether xterm should use the given font metrics for
      TrueType fonts, or amend the ascent/descent to total no more than the
      given font-height. This optional feature is used to work around
      inconsistencies in FreeType's rounding computation. The default is
      “false”, denoting the given metrics.
- foreground (class Foreground)
- Specifies the color to use for displaying text in the window. Setting the
      class name instead of the instance name is an easy way to have everything
      that would normally appear in the text color change color. The default is
      “XtDefaultForeground”.
- formatOtherKeys (class FormatOtherKeys)
- Overrides the format of the escape sequence used to report modified keys
      with the modifyOtherKeys resource.
  - 0
- send modified keys as parameters for function-key 27 (default).
- 1
- send modified keys as parameters for CSI u.
 
  - freeBoldBox (class FreeBoldBox)
- Specifies whether xterm should assume the bounding boxes for normal
      and bold fonts are compatible. If “false”, xterm
      compares them and will reject choices of bold fonts that do not match the
      size of the normal font. The default is “false”, which means
      that the comparison is performed.
- geometry (class Geometry)
- Specifies the preferred size and position of the VTxxx window.
      There is no default for this resource.
- highlightColor (class HighlightColor)
- Specifies the color to use for the background of selected (highlighted)
      text. If not specified (i.e., matching the default foreground), reverse
      video is used. The default is “XtDefaultForeground”.
- highlightColorMode (class
    HighlightColorMode)
- Specifies whether xterm should use highlightTextColor and
      highlightColor to override the reversed foreground/background
      colors in a selection. The default is unspecified: at startup,
      xterm checks if those resources are set to something other than the
      default foreground and background colors. Setting this resource disables
      the check.
  
  - The following table shows the interaction of the highlighting resources,
      abbreviated as shown to fit in this page:
  - HCM
- highlightColorMode
- HR
- highlightReverse
- HBG
- highlightColor
- HFG
- highlightTextColor
 
  
  - 
    
      
        | HCM | HR | HBG | HFG | Highlight |  
       
        | false | false | default | default | bg/fg |  
        | false | false | default | set | bg/fg |  
        | false | false | set | default | fg/HBG |  
        | false | false | set | set | fg/HBG |  
        | false | true | default | default | bg/fg |  
        | false | true | default | set | bg/fg |  
        | false | true | set | default | fg/HBG |  
        | false | true | set | set | fg/HBG |  
        | true | false | default | default | bg/fg |  
        | true | false | default | set | HFG/fg |  
        | true | false | set | default | bg/HBG |  
        | true | false | set | set | HFG/HBG |  
        | true | true | default | default | bg/fg |  
        | true | true | default | set | HFG/fg |  
        | true | true | set | default | fg/HBG |  
        | true | true | set | set | HFG/HBG |  
        | default | false | default | default | bg/fg |  
        | default | false | default | set | bg/fg |  
        | default | false | set | default | fg/HBG |  
        | default | false | set | set | HFG/HBG |  
        | default | true | default | default | bg/fg |  
        | default | true | default | set | bg/fg |  
        | default | true | set | default | fg/HBG |  
        | default | true | set | set | HFG/HBG |  
 
  - highlightReverse (class HighlightReverse)
- Specifies whether xterm should reverse the selection foreground and
      background colors when selecting text with reverse-video attribute. This
      applies only to the highlightColor and highlightTextColor
      resources, e.g., to match the color scheme of xwsh. If
      “true”, xterm reverses the colors, If
      “false”, xterm does not reverse colors, The default
      is “true”.
- highlightSelection (class
    HighlightSelection)
- Tells xterm whether to highlight all of the selected positions, or
      only the selected text:
  - If “false”, selecting with the mouse highlights all
      positions on the screen between the beginning of the selection and the
      current position.
- If “true”, xterm highlights only the positions that
      contain text that can be selected.
 
  
  - The default is “false”.
- Depending on the way your applications write to the screen, there may be
      trailing blanks on a line. Xterm stores data as it is shown on the
      screen. Erasing the display changes the internal state of each cell so it
      is not considered a blank for the purpose of selection. Blanks written
      since the last erase are selectable. If you do not wish to have trailing
      blanks in a selection, use the trimSelection resource.
  - highlightTextColor (class
    HighlightTextColor)
- Specifies the color to use for the foreground of selected (highlighted)
      text. If not specified (i.e., matching the default background), reverse
      video is used. The default is “XtDefaultBackground”.
- hpLowerleftBugCompat (class
    HpLowerleftBugCompat)
- Specifies whether to work around a bug in HP's xdb, which ignores
      termcap and always sends ESC F to move to the lower left corner.
      “true” causes xterm to interpret ESC F as a request
      to move to the lower left corner of the screen. The default is
      “false”.
- i18nSelections (class I18nSelections)
- If false, xterm will not request the targets COMPOUND_TEXT
      or TEXT. The default is “true”. It may be set to
      false in order to work around ICCCM violations by other X clients.
- iconBorderColor (class BorderColor)
- Specifies the border color for the active icon window if this feature is
      compiled into xterm. Not all window managers will make the icon
      border visible.
- iconBorderWidth (class BorderWidth)
- Specifies the border width for the active icon window if this feature is
      compiled into xterm. The default is “2”. Not all
      window managers will make the border visible.
- iconFont (class IconFont)
- Specifies the font for the miniature active icon window, if this feature
      is compiled into xterm. The default is “nil2”.
- indicatorFormat (class IndicatorFormat)
- When displaying the status line using the indicator mode (i.e.,
      selecting DECSSDT line type 1), format the status using this
    resource.
  
  - The default value of the resource displays the version of xterm,
      the cursor position and the time/date:
    
      
 
 
“%{version%}  %{position%}  %{unixtime%}”
    
 
- If a “%” marker does not match any of the three special
      tokens used in the default resource setting, xterm uses
      strftime to interpret it.
  - initialFont (class InitialFont)
- Specifies which of the VT100 fonts to use initially. Values are the same
      as for the set-vt-font action. The default is “d”,
      i.e., “default”.
- inputMethod (class InputMethod)
- Tells xterm which type of input method to use. There is no default
      method.
- internalBorder (class BorderWidth)
- Specifies the number of pixels between the characters and the window
      border. The default is “2”.
- italicULMode (class ColorAttrMode)
- Specifies whether characters with the underline attribute should be
      displayed in an italic font or as underlined characters. It is implemented
      only for TrueType fonts.
- jumpScroll (class JumpScroll)
- Specifies whether or not jump scroll should be used. This corresponds to
      the VT102 DECSCLM private mode. The default is “true”. See
      fastScroll for a variation.
- keepClipboard (class KeepClipboard)
- Specifies whether xterm will reuse the selection data which it
      copied to the clipboard rather than asking the clipboard for its current
      contents when told to provide the selection. The default is
      “false”.
  
  - If compiled into xterm, the menu entry Keep Clipboard allows
      you to change this at runtime.
  - keepSelection (class KeepSelection)
- Specifies whether xterm will keep the selection even after the
      selected area was touched by some output to the terminal. The default is
      “true”.
  
  - The menu entry Keep Selection allows you to change this at
    runtime.
  - keyboardDialect (class KeyboardDialect)
- Specifies the initial keyboard dialect, as well as the default value when
      the terminal is reset. The value given is the same as the final character
      in the control sequences which change character sets. The default is
      “B”, which corresponds to US ASCII.
- limitFontsets (class LimitFontsets)
- Limits the number of TrueType fallback fonts (i.e., fontset) which can be
      used. The default is “50”.
  
  - This limits the number of fallback fonts which xterm uses to
      display characters. Because TrueType fonts typically are small,
      xterm may open several fonts for good coverage, and may open
      additional fonts to obtain information. You can see which font-files
      xterm opens by setting the environment variable XFT_DEBUG to
      3. The Xft library and xterm write this debugging trace to the
      standard output.
- Set this to “0” to disable fallbacks entirely.
  - limitResize (class LimitResize)
- Limits resizing of the screen via control sequence to a given multiple of
      the display dimensions. The default is “1”.
- limitResponse (class LimitResponse)
- Limits the buffer-size used when xterm replies to various control
      sequences. The default is “1024”. The minimum value is
      “256”.
- locale (class Locale)
- Specifies how to use luit, an encoding converter between UTF-8 and
      locale encodings. The resource value (ignoring case) may be:
  - true
- Xterm will use the encoding specified by the users' LC_CTYPE locale
      (i.e., LC_ALL, LC_CTYPE, or LANG variables) as far as possible. This is
      realized by always enabling UTF-8 mode and invoking luit in
      non-UTF-8 locales.
- medium
- Xterm will follow users' LC_CTYPE locale only for UTF-8, east
      Asian, and Thai locales, where the encodings were not supported by
      conventional 8bit mode with changing fonts. For other locales,
      xterm will use conventional 8bit mode.
- checkfont
- If mini-luit is compiled-in, xterm will check if a Unicode font has
      been specified. If so, it checks if the character encoding for the current
      locale is POSIX, Latin-1 or Latin-9, uses the appropriate mapping to
      support those with the Unicode font. For other encodings, xterm
      assumes that UTF-8 encoding is required.
- false
- Xterm will use conventional 8bit mode or UTF-8 mode according to
      utf8 resource or -u8 option.
 
  
  - Any other value, e.g., “UTF-8” or “ISO8859-2”,
      is assumed to be an encoding name; luit will be invoked to support
      the encoding. The actual list of supported encodings depends on
      luit. The default is “medium”.
- Regardless of your locale and encoding, you need an ISO-10646-1 font to
      display the result. Your configuration may not include this font, or
      locale-support by xterm may not be needed.
- At startup, xterm uses a mechanism equivalent to the
      load-vt-fonts(utf8Fonts, Utf8Fonts) action to load font name
      subresources of the VT100 widget. That is, resource patterns such as
      “*vt100.utf8Fonts.font” will be loaded, and (if this
      resource is enabled), override the normal fonts. If no subresources are
      found, the normal fonts such as “*vt100.font”, etc.,
      are used.
- For instance, you could have this in your resource file:
    
      
 
 
*VT100.font: 12x24
*VT100.utf8Fonts.font:9x15
    
 
- When started with a UTF-8 locale, xterm would use 9x15, but allow
      you to switch to the 12x24 font using the menu entry “UTF-8
      Fonts”.
- The resource files distributed with xterm use ISO-10646-1 fonts,
      but do not rely on them unless you are using the locale mechanism.
  - localeFilter (class LocaleFilter)
- Specifies the file name for the encoding converter from/to locale
      encodings and UTF-8 which is used with the -lc option or
      locale resource. The help message shown by “xterm
      -help” lists the default value, which depends on your system
      configuration.
  
  - If the encoding converter requires command-line parameters, you can add
      those after the command, e.g.,
    
      
 
 
*localeFilter: xterm-filter -p
    
 
- Alternatively, you may put those parameter within a shell script to
      execute the converter, and set this resource to point to the shell
    script.
- When using a locale-filter, e.g., with the -e option, or the shell,
      xterm first tries passing control via that filter. If it fails,
      xterm will retry without the locale-filter. Xterm warns
      about the failure before retrying.
  - logFile (class Logfile)
- Specify the name for xterm's log file. If no name is specified,
      xterm will generate a name when logging is enabled, as described in
      the -l option.
- logInhibit (class LogInhibit)
- If “true”, prevent the logging feature from being enabled,
      whether by the command-line option -l, or the menu entry Log to
      File. The default is “false”.
- logging (class Logging)
- If “true”, (and if logInhibit is not set) enable the
      logging feature. This resource is set/updated by the -l option and
      the menu entry Log to File. The default is
    “false”.
- loginShell (class LoginShell)
- Specifies whether or not the shell to be run in the window should be
      started as a login shell. The default is “false”.
- marginBell (class MarginBell)
- Specifies whether or not the bell should be rung when the user types near
      the right margin. The default is “false”.
- maxGraphicSize (class MaxGraphicSize)
- If xterm is configured to support ReGIS or SIXEL graphics, this
      resource controls the maximum size of a graph which can be displayed.
  
  - The default is “1000x1000” (given as width by
      height).
- If the resource is “auto” then xterm will use the
      decGraphicsID resource (or decTerminalID if that is not
      set):
    
      
        | Result | decGraphicsID |  
       
        | 768x400 | 125 |  
        | 800x460 | 240 |  
        | 800x460 | 241 |  
        | 800x480 | 330 |  
        | 800x480 | 340 |  
        | 860x750 | 382 |  
        | 800x480 | other |  
 
  - metaSendsEscape (class MetaSendsEscape)
- Tells xterm what to do with input-characters modified by
      Meta:
  - If “true”, Meta characters (a character combined with the
      Meta modifier key) are converted into a two-character sequence with
      the character itself preceded by ESC. This applies as well to function key
      control sequences, unless xterm sees that Meta is used in
      your key translations.
- If “false”, Meta characters input from the keyboard are
      handled according to the eightBitInput resource.
 
  
  - The default is “False”.
  - mkSamplePass (class MkSamplePass)
- If mkSampleSize is nonzero, and mkWidth (and
      cjkWidth) are false, on startup xterm compares its built-in
      tables to the system's wide character width data to decide if it will use
      the system's data. It tests the first mkSampleSize character
      values, and allows up to mkSamplePass mismatches before the test
      fails. The default (for the allowed number of mismatches) is 655 (one
      percent of the default value for mkSampleSize).
- mkSampleSize (class MkSampleSize)
- With mkSamplePass, this specifies a startup test used for
      initializing wide character width calculations. The default (number of
      characters to check) is 65536.
- mkWidth (class MkWidth)
- Specifies whether xterm should use a built-in version of the wide
      character width calculation. See also the cjkWidth resource which
      can override this. The default is “false”.
  
  - Here is a summary of the resources which control the choice of wide
      character width calculation:
    
      
        | cjkWidth | mkWidth | Action |  
       
        | false | false | use system tables subject to mkSamplePass |  
        | false | true | use built-in tables |  
        | true | false | use built-in CJK tables |  
        | true | true | use built-in CJK tables |  
 
- To disable mkWidth, and use the system's tables, set both
      mkSampleSize and mkSamplePass to “0”. Doing
      that may make xterm more consistent with applications running in
      xterm, but may omit some font glyphs whose width correctly differs
      from the system's character tables.
  - modifyCursorKeys (class ModifyCursorKeys)
- Tells how to handle the special case where Control-, Shift-, Alt- or
      Meta-modifiers are used to add a parameter to the escape sequence returned
      by a cursor-key. The default is “2”:
  - -1
- disables the feature.
- 0
- uses the old/obsolete behavior, i.e., the modifier is the first
    parameter.
- 1
- prefixes modified sequences with CSI.
- 2
- forces the modifier to be the second parameter if it would otherwise be
      the first.
- 3
- marks the sequence with a “>” to hint that it is
    private.
 
  - modifyFunctionKeys (class
    ModifyFunctionKeys)
- Tells how to handle the special case where Control-, Shift-, Alt- or
      Meta-modifiers are used to add a parameter to the escape sequence returned
      by a (numbered) function-key. The default is “2”. The
      resource values are similar to modifyCursorKeys:
  - -1
- permits the user to use shift- and control-modifiers to construct
      function-key strings using the normal encoding scheme.
- 0
- uses the old/obsolete behavior, i.e., the modifier is the first
    parameter.
- 1
- prefixes modified sequences with CSI.
- 2
- forces the modifier to be the second parameter if it would otherwise be
      the first.
- 3
- marks the sequence with a “>” to hint that it is
    private.
 
  
  - If modifyFunctionKeys is zero, xterm uses Control- and
      Shift-modifiers to allow the user to construct numbered function-keys
      beyond the set provided by the keyboard:
  - Control
- adds the value given by the ctrlFKeys resource.
- Shift
- adds twice the value given by the ctrlFKeys resource.
- Control/Shift
- adds three times the value given by the ctrlFKeys resource.
 
  - modifyKeyboard (class ModifyKeyboard)
- Normally xterm makes a special case regarding modifiers (shift,
      control, etc.) to handle special keyboard layouts (legacy and
      vt220). This is done to provide compatible keyboards for DEC VT220
      and related terminals that implement user-defined keys (UDK).
  
  - The bits of the resource value selectively enable modification of the
      given category when these keyboards are selected. The default is
      “0”:
  - 0
- The legacy/vt220 keyboards interpret only the Control-modifier when
      constructing numbered function-keys. Other special keys are not
    modified.
- 1
- allows modification of the numeric keypad
- 2
- allows modification of the editing keypad
- 4
- allows modification of function-keys, overrides use of Shift-modifier for
      UDK.
- 8
- allows modification of other special keys
 
  - modifyOtherKeys (class ModifyOtherKeys)
- Like modifyCursorKeys, tells xterm to construct an escape
      sequence for ordinary (i.e., “other”) keys (such as
      “2”) when modified by Shift-, Control-, Alt- or
      Meta-modifiers. This feature does not apply to special keys, i.e.,
      cursor-, keypad-, function- or control-keys which are labeled on your
      keyboard. Those have key symbols which XKB identifies uniquely.
  
  - For example, this feature does not apply to special control-keys
      (e.g., Escape, Tab, Enter, Backspace) Other control keys (e.g., Control-I,
      Control-M, Control-H) may send escape sequences when this feature is
      enabled.
- The default is “0”:
  - 0
- disables this feature.
- 1
- enables this feature for keys except for those with well-known behavior,
      e.g., Tab, Backarrow and some special control character cases which are
      built into the X11 library, e.g., Control-Space to make a NUL, or
      Control-3 to make an Escape character.
  
  - Except for those special cases built into the X11 library, the Shift- and
      Control- modifiers are treated normally. The Alt- and Meta- modifiers do
      not cause xterm to send escape sequences. Those modifier keys are
      interpreted according to other resources, e.g., the metaSendsEscape
      resource.
  - 2
- enables this feature for keys including the exceptions listed.
      Xterm ignores the special cases built into the X11 library. Any
      shifted (modified) ordinary key sends an escape sequence. The Alt- and
      Meta- modifiers cause xterm to send escape sequences.
 
  
  - The Xterm FAQ has an extended discussion of this feature, with
      examples:
    
  
https://invisible-island.net/xterm/modified-keys.html
  - multiClickTime (class MultiClickTime)
- Specifies the maximum time in milliseconds between multi-click select
      events. The default is “250” milliseconds.
- multiScroll (class MultiScroll)
- Specifies whether or not scrolling should be done asynchronously. The
      default is “false”.
- nMarginBell (class Column)
- Specifies the number of characters from the right margin at which the
      margin bell should be rung, when enabled by the marginBell
      resource. The default is “10”.
- nameKeymap (class
    NameKeymap)
- See the discussion of the keymap() action.
- nextEventDelay (class NextEventDelay)
- Specifies a delay time in milliseconds before checking for new X events.
      The default is “1”.
- numColorRegisters (class
    NumColorRegisters)
- If xterm is configured to support ReGIS or SIXEL graphics, this
      specifies the number of color-registers which are available.
  
  - If this resource is not specified, xterm uses a value determined by
      the decTerminalID resource:
    
      
        | Result | decTerminalID |  
       
        | 4 | 125 |  
        | 4 | 240 |  
        | 4 | 241 |  
        | 4 | 330 |  
        | 16 | 340 |  
        | 2 | 382 |  
        | 1024 | other |  
 
  - numLock (class NumLock)
- If “true”, xterm checks if NumLock is used as a
      modifier (see xmodmap(1)). If so, this modifier is used to simplify
      the logic when implementing special NumLock for the sunKeyboard
      resource. Also (when sunKeyboard is false), similar logic is used
      to find the modifier associated with the left and right Alt keys. The
      default is “true”.
- oldXtermFKeys (class OldXtermFKeys)
- If “true”, xterm will use old-style (X11R5) escape
      sequences for function keys F1 to F4, for compatibility with X Consortium
      xterm. Otherwise, it uses the VT100 codes for PF1 to PF4. The
      default is “false”.
  
  - Setting this resource has the same effect as setting the
      keyboardType to legacy. The keyboardType resource is
      the preferred mechanism for selecting this mode.
- The old-style escape sequences resemble VT220 keys, but appear to have
      been invented for xterm in X11R4.
  - on2Clicks (class On2Clicks)
- on3Clicks (class On3Clicks)
- on4Clicks (class On4Clicks)
- on5Clicks (class On5Clicks)
- Specify selection behavior in response to multiple mouse clicks. A single
      mouse click is always interpreted as described in the Selection
      Functions section (see POINTER USAGE). Multiple mouse clicks
      (using the button which activates the select-start action) are
      interpreted according to the resource values of on2Clicks, etc. The
      resource value can be one of these:
  - word
- Select a “word” as determined by the charClass
      resource. See the CHARACTER CLASSES section.
  
  - If the pointer is on a “word” then xterm searches
      back to the beginning of the word, and then to the end.
- If the pointer is not on a “word” then the result depends on
      whether it is on whitespace (including a newline), or past the end of the
      line. In the latter case xterm may select a “word”
      beginning after the newline, if there is no additional whitespace.
  - line
- Select a line (counting wrapping).
- group
- Select a group of adjacent lines (counting wrapping). The selection stops
      on a blank line, and does not extend outside the current page.
- page
- Select all visible lines, i.e., the page.
- all
- 
    
 Select all lines, i.e., including the saved lines.
- regex
- Select the best match for the POSIX extended regular expression (ERE)
      which follows in the resource value:
  - Xterm matches the regular expression against a byte array for the
      entire (possibly wrapped) line. That byte array may be UTF-8 or
      ISO-8859-1, depending on the mode in which xterm is running.
- Xterm steps through each byte-offset in this array, keeping track
      of the best (longest) match. If more than one match ties for the longest
      length, the first is used.
  
  - Xterm does this to make it convenient to click anywhere in the area
      of interest and cause the regular expression to match the entire word,
      etc.
  - The “^” and “$” anchors in a regular
      expression denote the ends of the entire line.
- If the regular expression contains backslashes “\” those
      should be escaped “\\” because the X libraries interpret
      backslashes in resource strings.
 
  - none
- No selection action is associated with this resource. Xterm
      interprets it as the end of the list. For example, you may use it to
      disable triple (and higher) clicking by setting on3Clicks to
      “none”.
 
  
  - The default values for on2Clicks and on3Clicks are
      “word” and “line”, respectively. There is no
      default value for on4Clicks or on5Clicks, making those
      inactive. On startup, xterm determines the maximum number of clicks
      by the onXClicks resource values which are set.
  - openIm (class OpenIm)
- Tells xterm whether to open the input method at startup. The
      default is “true”.
- pointerColor (class PointerColor)
- Specifies the foreground color of the pointer. The default is
      “XtDefaultForeground”.
- pointerColorBackground (class
    PointerColorBackground)
- Specifies the background color of the pointer. The default is
      “XtDefaultBackground”.
- pointerFont (class PointerFont)
- Specifies the font to be used for the pointer. The shapes specified by
      pointerShape are glyphs in this font. The resource value default is
      cursor.
- pointerMode (class PointerMode)
- Specifies when the pointer may be hidden as the user types. It will be
      redisplayed if the user moves the mouse, or clicks one of its
    buttons.
  - 0
- never. This is the default.
- 1
- the application running in xterm has not activated mouse mode.
- 2
- always.
 
  - pointerShape (class Cursor)
- Specifies the name of the shape of the pointer. The default is
      “xterm”.
  
  - Other shapes can be selected. Here is a list of the “core”
      (i.e., standard) names extracted from
    <X11/cursorfont.h>:
  
  - X_cursor, arrow, based_arrow_down, based_arrow_up, boat, bogosity,
      bottom_left_corner, bottom_right_corner, bottom_side, bottom_tee,
      box_spiral, center_ptr, circle, clock, coffee_mug, cross, cross_reverse,
      crosshair, diamond_cross, dot, dotbox, double_arrow, draft_large,
      draft_small, draped_box, exchange, fleur, gobbler, gumby, hand1, hand2,
      heart, icon, iron_cross, left_ptr, left_side, left_tee, leftbutton,
      ll_angle, lr_angle, man, middlebutton, mouse, pencil, pirate, plus,
      question_arrow, right_ptr, right_side, right_tee, rightbutton, rtl_logo,
      sailboat, sb_down_arrow, sb_h_double_arrow, sb_left_arrow, sb_right_arrow,
      sb_up_arrow, sb_v_double_arrow, shuttle, sizing, spider, spraycan, star,
      target, tcross, top_left_arrow, top_left_corner, top_right_corner,
      top_side, top_tee, trek, ul_angle, umbrella, ur_angle, watch, xterm
 
  
  - If you are using a cursor theme, expect it to provide about a third
      of those names, while adding others.
  - popOnBell (class PopOnBell)
- Specifies whether the window would be raised when Control-G is received.
      The default is “false”.
  
  - If the window is iconified, this has no effect. However, the
      zIconBeep resource provides you with the ability to see which
      iconified windows have sounded a bell.
  - precompose (class Precompose)
- Tells xterm whether to precompose UTF-8 data into Normalization
      Form C, which combines commonly-used accents onto base characters. If it
      does not do this, accents are left as separate characters. The default is
      “true”.
- preeditType (class PreeditType)
- Tells xterm which types of preedit (preconversion) string to
      display. The default is “OverTheSpot,Root”.
- printAttributes (class PrintAttributes)
- Specifies whether to print graphic attributes along with the text. A real
      DEC VTxxx terminal will print the underline, highlighting codes but
      your printer may not handle these.
  - “0” disables the attributes.
- “1” prints the normal set of attributes (bold, underline,
      inverse and blink) as VT100-style control sequences.
- “2” prints ANSI color attributes as well.
 
  
  - The default is “1”.
  - printFileImmediate (class
    PrintFileImmediate)
- When the print-immediate action is invoked, xterm prints the
      screen contents directly to a file. Set this resource to the prefix of the
      filename (a timestamp will be appended to the actual name).
  
  - The default is an empty string, i.e., “”, However, when the
      print-immediate action is invoked, if the string is empty, then
      “XTerm” is used.
  - printFileOnXError (class
    PrintFileOnXError)
- If xterm exits with an X error, e.g., your connection is broken
      when the server crashes, it can be told to write the contents of the
      screen to a file. To enable the feature, set this resource to the prefix
      of the filename (a timestamp will be appended to the actual name).
  
  - The default is an empty string, i.e., “”, which disables
      this feature. However, when the print-on-error action is invoked,
      if the string is empty, then “XTermError” is used.
- These error codes are handled: ERROR_XERROR, ERROR_XIOERROR and
      ERROR_ICEERROR.
  - printModeImmediate (class
    PrintModeImmediate)
- When the print-immediate action is invoked, xterm prints the
      screen contents directly to a file. You can use the
      printModeImmediate resource to tell it to use escape sequences to
      reconstruct the video attributes and colors. This uses the same values as
      the printAttributes resource. The default is
    “0”.
- printModeOnXError (class
    PrintModeOnXError)
- Xterm implements the printFileOnXError feature using the
      printer feature, although the output is written directly to a file. You
      can use the printModeOnXError resource to tell it to use escape
      sequences to reconstruct the video attributes and colors. This uses the
      same values as the printAttributes resource. The default is
      “0”.
- printOptsImmediate (class
    PrintOptsImmediate)
- Specify the range of text which is printed to a file when the
      print-immediate action is invoked.
  - If zero (0), then this selects the current (visible screen) plus the saved
      lines, except if the alternate screen is being used. In that case, only
      the alternate screen is selected.
- If nonzero, the bits of this resource value (checked in descending order)
      select the range:
  - 8
- selects the saved lines.
- 4
- selects the alternate screen.
- 2
- selects the normal screen.
- 1
- selects the current screen, which can be either the normal or alternate
      screen.
 
 
  
  - The default is “9”, which selects the current visible screen
      plus saved lines, with no special case for the alternated screen.
  - printOptsOnXError (class
    PrintOptsOnXError)
- Specify the range of text which is printed to a file when the
      print-on-error action is invoked. The resource value is interpreted
      the same as in printOptsImmediate.
  
  - The default is “9”, which selects the current visible screen
      plus saved lines, with no special case for the alternated screen.
  - printerAutoClose (class PrinterAutoClose)
- If “true”, xterm will close the printer (a pipe) when
      the application switches the printer offline with a Media Copy command.
      The default is “false”.
- printerCommand (class PrinterCommand)
- Specifies a shell command to which xterm will open a pipe when the
      first MC (Media Copy) command is initiated. The default is an empty
      string, i.e., “”. If the resource value is given as an empty
      string, the printer is disabled.
- printerControlMode (class
    PrinterControlMode)
- Specifies the printer control mode. A “1” selects autoprint
      mode, which causes xterm to print a line from the screen when
  - you move the cursor off that line with a line feed, form feed or vertical
      tab character, or
- an autowrap occurs.
 
  
  - Autoprint mode is overridden by printer controller mode (a
      “2”), which causes all of the output to be directed to the
      printer. The default is “0”.
  - printerExtent (class PrinterExtent)
- Controls whether a print page function will print the entire page (true),
      or only the portion within the scrolling margins (false). The default is
      “false”.
- printerFormFeed (class PrinterFormFeed)
- Controls whether a form feed is sent to the printer at the end of a print
      page function. The default is “false”.
- printerNewLine (class PrinterNewLine)
- Controls whether a newline is sent to the printer at the end of a print
      page function. The default is “true”.
- privateColorRegisters (class
    PrivateColorRegisters)
- If xterm is configured to support ReGIS or SIXEL graphics, this
      controls whether xterm allocates separate color registers for each
      sixel device control string, e.g., for DECGCI. If not true, color
      registers are allocated only once, when the terminal is reset, and color
      changes in any graphic affect all graphics. The default is
      “true”.
- quietGrab (class QuietGrab)
- Controls whether the cursor is repainted when NotifyGrab and
      NotifyUngrab event types are received during change of focus. The
      default is “false”.
- regisDefaultFont (class RegisDefaultFont)
- If xterm is configured to support ReGIS graphics, this resource
      tells xterm which font to use if the ReGIS data does not specify
      one. No default value is specified; xterm accepts a TrueType font
      specification as in the faceName resource.
  
  - If no value is specified, xterm draws a bitmap indicating a missing
      character.
  - regisScreenSize (class RegisScreenSize)
- If xterm is configured to support ReGIS graphics, this resource
      tells xterm the default size (in pixels) for these graphics, which
      also sets the default coordinate space to [0,0] (upper-left) and
      [width,height] (lower-right).
  
  - The application using ReGIS may use the “A” option of the
      “S” command to adjust the coordinate space or change the
      addressable portion of the screen.
- Xterm accepts a special resource value “auto”, which
      tells xterm to use the decGraphicsID and
      decTerminalID resources to set the default size based on the
      hardware terminal's limits. Those limits are the same as for the
      maxGraphicSize resource.
- The default is “auto”.
  - renderFont (class RenderFont)
- If xterm is built with the Xft library, this controls whether the
      faceName resource is used. The default is
    “default”.
  
  - The resource values are strings, evaluated as booleans after startup.
  - false
- 
    
 disable the feature and use the normal (bitmap) font.
- true
- 
    
 startup using the TrueType font specified by the faceName and
      faceSize resource settings. If there is no value for
      faceName, disable the feature and use the normal (bitmap)
    font.
  
  - After startup, you can still switch to/from the bitmap font using the
      “TrueType Fonts” menu entry.
  - default
- 
    
 Enable the “TrueType Fonts” menu entry to allow runtime
      switching to/from TrueType fonts. The initial font used depends upon
      whether the faceName resource is set:
  - If the faceName resource is not set, start by using the normal
      (bitmap) font. Xterm has a separate compiled-in value for
      faceName for this special case. That is normally
      “mono”.
- If the faceName resource is set, then start by using the TrueType
      font rather than the bitmap font.
 
  - defaultOff
- 
    
 Enable the “TrueType Fonts” menu entry to allow runtime
      switching to/from TrueType fonts, but allow it to be initially unselected
      if no faceName resource was given.
 
  - resizeByPixel (class ResizeByPixel)
- Set this “true” to disable hints to the window manager that
      request resizing by character rather than pixels.
  
  - Most window managers provide visual feedback showing the size of a window
      as you resize it, using these hints. When you maximize xterm, it
      disables those hints to allow the window manager to make better use of
      fractional rows or columns. Setting this resource disables the hints all
      the time.
- The default is “false”.
  - resizeGravity (class ResizeGravity)
- Affects the behavior when the window is resized to be taller or shorter.
      NorthWest specifies that the top line of text on the screen stay
      fixed. If the window is made shorter, lines are dropped from the bottom;
      if the window is made taller, blank lines are added at the bottom. This is
      compatible with the behavior in X11R4. SouthWest (the default)
      specifies that the bottom line of text on the screen stay fixed. If the
      window is made taller, additional saved lines will be scrolled down onto
      the screen; if the window is made shorter, lines will be scrolled off the
      top of the screen, and the top saved lines will be dropped.
- retryInputMethod (class RetryInputMethod)
- Tells xterm how many times to retry, in case the input-method
      server is not responding. This is a different issue than unsupported
      preedit type, etc. You may encounter retries if your X configuration (and
      its libraries) are missing pieces. Setting this resource to zero
      “0” will cancel the retrying. The default is
      “3”.
- reverseVideo (class ReverseVideo)
- Specifies whether or not reverse video should be simulated. The default is
      “false”.
  
  - There are several aspects to reverse video in xterm:
  - The command-line -rv option tells the X libraries to reverse the
      foreground and background colors. Xterm's command-line options set
      resource values. In particular, the X Toolkit sets the reverseVideo
      resource when the -rv option is used.
- If the user has also used command-line options -fg or -bg to
      set the foreground and background colors, xterm does not see these
      options directly. Instead, it examines the resource values to reconstruct
      the command-line options, and determine which of the colors is the user's
      intended foreground, etc. Their actual values are irrelevant to the
      reverse video function; some users prefer the X defaults (black text on a
      white background), others prefer white text on a black background.
- After startup, the user can toggle the “Enable Reverse
      Video” menu entry. This exchanges the current foreground and
      background colors of the VT100 widget, and repaints the screen. Because of
      the X resource hierarchy, the reverseVideo resource applies to more
      than the VT100 widget.
 
  
  - Programs running in an xterm can also use control sequences to
      enable the VT100 reverse video mode. These are independent of the
      reverseVideo resource and the menu entry. Xterm exchanges
      the current foreground and background colors when drawing text affected by
      these control sequences.
- Other control sequences can alter the foreground and background colors
      which are used:
  - Programs can also use the ANSI color control sequences to set the
      foreground and background colors.
- Extensions to the ANSI color controls (such as 16-, 88- or 256-colors) are
      treated similarly to the ANSI control.
- Using other control sequences (the “dynamic colors”
      feature), a program can change the foreground and background colors.
 
  - reverseWrap (class ReverseWrap)
- Specifies whether or not reverse-wraparound should be enabled. This
      corresponds to xterm's private mode 45. The default is
      “false”.
- rightScrollBar (class RightScrollBar)
- Specifies whether or not the scrollbar should be displayed on the right
      rather than the left. The default is “false”.
- saveLines (class SaveLines)
- Specifies the number of lines to save beyond the top of the screen when a
      scrollbar is turned on. The default is “1024”.
- scrollBar (class ScrollBar)
- Specifies whether or not the scrollbar should be displayed. The default is
      “false”.
- scrollBarBorder (class ScrollBarBorder)
- Specifies the width of the scrollbar border. Note that this is drawn to
      overlap the border of the xterm window. Modifying the scrollbar's
      border affects only the line between the VT100 widget and the scrollbar.
      The default value is 1.
- scrollKey (class ScrollCond)
- Specifies whether or not pressing a key should automatically cause the
      scrollbar to go to the bottom of the scrolling region. This corresponds to
      xterm's private mode 1011. The default is
    “false”.
- scrollLines (class ScrollLines)
- Specifies the number of lines that the scroll-back and
      scroll-forw actions should use as a default. The default value is
      1.
- scrollTtyOutput (class ScrollCond)
- Specifies whether or not output to the terminal should automatically cause
      the scrollbar to go to the bottom of the scrolling region. The default is
      “true”.
- selectToClipboard (class
    SelectToClipboard)
- Tells xterm whether to use the PRIMARY or CLIPBOARD
      for SELECT tokens in the selection mechanism. The set-select
      action can change this at runtime, allowing the user to work with programs
      that handle only one of these mechanisms. The default is
      “false”, which tells it to use PRIMARY.
- shiftEscape (class ShiftEscape)
- Xterm uses the translations resource to determine how to
      invoke actions for selecting and copying text using the pointer (e.g., a
      mouse). It also provides a mouse protocol which can be used by
      applications running in an xterm to detect mouse button clicks.
  
  - The mouse protocol causes xterm to send special escape sequences
      which allow an application to determine if modifiers (i.e., one or
      more of shift, control, alt, and meta) were
      used.
- Xterm provides this mouse protocol by interpreting button- and
      motion-events in the functions which the translations resource
      calls for selecting and copying text:
  
  - 
    
insert-selection
select-end
select-extend
select-start
start-extend
    
 
  
  - While the mouse protocol is active, xterm reserves most of the
      mouse button events for sending special escape sequences to the
      application. Xterm normally allows you to use the shift-key
      to temporarily override this mouse protocol, permitting the selection and
      copying actions to be used.
- The shiftEscape resource setting allows you to tell xterm
      whether to use the shift-key in this way (i.e., overriding the
      mouse protocol). Xterm accepts either a keyword (ignoring case) or
      the number shown in parentheses:
  - false (0)
- Mouse protocol does not send special escapes when shift-key is
      used.
- true (1)
- Mouse protocol may send special escapes when shift-key is
    used.
  
  - At startup, xterm analyzes the translations to see which
      buttons are used in the (mouse) button-related bindings for selection and
      copying text. If the shift-key is not mentioned explicitly in a
      button's binding, xterm allows that button with shift-key
      for overriding the mouse protocol.
  - always (2)
- Mouse protocol can always send special escapes when shift-key is
      used.
- never (3)
- Mouse protocol will never send special escapes when shift-key is
      used.
 
  
  - Xterm interprets a control sequence which can change this setting
      between “true” and “false”. The default is
      “false”.
  - shiftFonts (class ShiftFonts)
- Specifies whether to enable the actions larger-vt-font() and
      smaller-vt-font(), which are normally bound to the shifted KP_Add
      and KP_Subtract. The default is “true”.
- showBlinkAsBold (class ShowBlinkAsBold)
- Tells xterm whether to display text with blink-attribute the same
      as bold. If xterm has not been configured to support blinking text,
      the default is “true”, which corresponds to older versions
      of xterm, otherwise the default is “false”.
- showMissingGlyphs (class
    ShowMissingGlyphs)
- Tells xterm whether to display a box outlining places where a
      character has been used that the font does not represent. The default is
      “false”.
- showWrapMarks (class ShowWrapMarks)
- For debugging xterm and applications that may manipulate the
      wrapped-line flag by writing text at the right margin, show a mark on the
      right inner-border of the window. The mark shows which lines have the flag
      set.
- signalInhibit (class SignalInhibit)
- Specifies whether or not the entries in the Main Options menu for
      sending signals to xterm should be disallowed. The default is
      “false”.
- sixelScrolling (class SixelScrolling)
- If xterm is configured to support SIXEL graphics, this resource
      tells it whether to scroll up one line at a time when sixels would be
      written past the bottom line on the window. The default is
      “false” which enables scrolling.
- sixelScrollsRight (class
    SixelScrollsRight)
- If xterm is configured to support SIXEL graphics, this resource
      tells it whether to scroll to the right as needed to keep the current
      position visible rather than truncate the plot on the on the right. The
      default is “false” which disables scrolling.
- tekGeometry (class Geometry)
- Specifies the preferred size and position of the Tektronix window. There
      is no default for this resource.
- tekInhibit (class TekInhibit)
- Specifies whether or not the escape sequence to enter Tektronix mode
      should be ignored. The default is “false”.
- tekSmall (class TekSmall)
- Specifies whether or not the Tektronix mode window should start in its
      smallest size if no explicit geometry is given. This is useful when
      running xterm on displays with small screens. The default is
      “false”.
- tekStartup (class TekStartup)
- Specifies whether or not xterm should start up in Tektronix mode.
      The default is “false”.
- tiXtraScroll (class TiXtraScroll)
- Specifies whether xterm should scroll to a new page when processing
      the ti or te termcap strings, i.e., the private modes 47,
      1047 or 1049. This is only in effect if titeInhibit is
      “true”, because the intent of this option is to provide a
      picture of the full-screen application's display on the scrollback without
      wiping out the text that would be shown before the application was
      initialized.
  
  - Xterm accepts either a keyword (ignoring case) or the number shown
      in parentheses:
  - false (0)
- nothing is added to the scrollback.
- true (1)
- the current screen is added to the scrollback.
- trim (2)
- the current screen is added to the scrollback, but repeated blank lines
      are trimmed (reduced to a single blank line).
 
  
  - The default for this resource is “false”.
  - titeInhibit (class TiteInhibit)
- Originally specified whether or not xterm should remove ti
      and te termcap entries (used to switch between alternate screens on
      startup of many screen-oriented programs) from the TERMCAP string.
  
  - TERMCAP is used rarely now, but xterm supports the feature on
      modern systems:
  - If set, xterm also ignores the escape sequence to switch to the
      alternate screen.
- Xterm supports terminfo in a different way, supporting composite
      control sequences (also known as private modes) 1047, 1048 and 1049 which
      have the same effect as the original 47 control sequence.
 
  
  - The default for this resource is “false”.
  - titleModes (class TitleModes)
- Tells xterm whether to accept or return window- and icon-labels in
      ISO-8859-1 (the default) or UTF-8. Either can be encoded in
    hexadecimal:
  - UTF-8 titles require special treatment, because they may contain bytes
      which can be mistaken for control characters. Hexadecimal-encoding is
      supported to eliminate that possibility.
- As an alternative, you could use the allowC1Printable resource,
      which suppresses xterm's parsing of the relevant control characters
      (and as a result, treats those bytes as data).
 
  
  - The default for this resource is “0”.
- Each bit (bit “0” is 1, bit “1” is 2, etc.)
      corresponds to one of the parameters set by the title modes control
      sequence:
  - 0
- Set window/icon labels using hexadecimal
- 1
- Query window/icon labels using hexadecimal
- 2
- Set window/icon labels using UTF-8 (gives the same effect as the
      utf8Title resource).
- 3
- Query window/icon labels using UTF-8
 
  - translations (class Translations)
- Specifies the key and button bindings for menus, selections,
      “programmed strings”, etc. The translations resource,
      which provides much of xterm's configurability, is a feature of the
      X Toolkit Intrinsics library (Xt). See the Actions section.
- trimSelection (class TrimSelection)
- If you set highlightSelection, you can see the text which is
      selected, including any trailing spaces. Clearing the screen (or a line)
      resets it to a state containing no spaces. Some lines may contain trailing
      spaces when an application writes them to the screen. However, you may not
      wish to paste lines with trailing spaces. If this resource is true,
      xterm will trim trailing spaces from text which is selected. It
      does not affect spaces which result in a wrapped line, nor will it trim
      the trailing newline from your selection. The default is
      “false”.
- underLine (class UnderLine)
- This specifies whether or not text with the underline attribute should be
      underlined. It may be desirable to disable underlining when color is being
      used for the underline attribute. The default is
    “true”.
- useBorderClipping (class
    UseBorderClipping)
- Tell xterm whether to apply clipping when useClipping is
      false. Unlike useClipping, this simply limits text to keep it
      within the window borders, e.g., as a refinement to the scaleHeight
      workaround. The default is “false”.
- useClipping (class UseClipping)
- Tell xterm whether to use clipping to keep from producing dots
      outside the text drawing area. Originally used to work around for
      overstriking effects, this is also needed to work with some
      incorrectly-sized fonts. The default is “true”.
- utf8 (class Utf8)
- This specifies whether xterm will run in UTF-8 mode. If you set
      this resource, xterm also sets the wideChars resource as a
      side-effect. The resource can be set via the menu entry “UTF-8
      Encoding”. The default is “default”.
  
  - Xterm accepts either a keyword (ignoring case) or the number shown
      in parentheses:
  - false (0)
- UTF-8 mode is initially off. The command-line option +u8 sets the
      resource to this value. Escape sequences for turning UTF-8 mode on/off are
      allowed.
- true (1)
- UTF-8 mode is initially on. Escape sequences for turning UTF-8 mode on/off
      are allowed.
- always (2)
- The command-line option -u8 sets the resource to this value. Escape
      sequences for turning UTF-8 mode on/off are ignored.
- default (3)
- This is the default value of the resource. It is changed during
      initialization depending on whether the locale resource was set, to
      false (0) or always (2). See the locale resource for additional
      discussion of non-UTF-8 locales.
 
  
  - If you want to set the value of utf8, it should be in this range.
      Other nonzero values are treated the same as “1”, i.e.,
      UTF-8 mode is initially on, and escape sequences for turning UTF-8 mode
      on/off are allowed.
  - utf8Fonts (class Utf8Fonts)
- See the discussion of the locale resource. This specifies whether
      xterm will use UTF-8 fonts specified via resource patterns such as
      “*vt100.utf8Fonts.font” or normal (ISO-8859-1) fonts
      via patterns such as “*vt100.font”. The resource can
      be set via the menu entry “UTF-8 Fonts”. The default
      is “default”.
  
  - Xterm accepts either a keyword (ignoring case) or the number shown
      in parentheses:
  - false (0)
- Use the ISO-8859-1 fonts. The menu entry is enabled, allowing the choice
      of fonts to be changed at runtime.
- true (1)
- Use the UTF-8 fonts. The menu entry is enabled, allowing the choice of
      fonts to be changed at runtime.
- always (2)
- Always use the UTF-8 fonts. This also disables the menu entry.
- default (3)
- At startup, the resource is set to true or false, according to the
      effective value of the utf8 resource.
 
  - utf8Latin1 (class Utf8Latin1)
- If true, allow an ISO-8859-1 normal font to be combined with an
      ISO-10646-1 font if the latter is given via the -fw option or its
      corresponding resource value. The default is “false”.
- utf8SelectTypes (class Utf8SelectTypes)
- Override xterm's default selection target list (see
      SELECT/PASTE) for selections in wide-character (UTF-8) mode. The
      default is an empty string, i.e., “”, which does not
      override anything.
- utf8Title (class Utf8Title)
- Applications can set xterm's title by writing a control sequence.
      Normally this control sequence follows the VT220 convention, which encodes
      the string in ISO-8859-1 and allows for an 8-bit string terminator. If
      xterm is started in a UTF-8 locale, it translates the ISO-8859-1
      string to UTF-8 to work with the X libraries which assume the string is
      UTF-8.
  
  - However, some users may wish to write a title string encoded in UTF-8. The
      window manager is responsible for drawing window titles. Some window
      managers (not all) support UTF-8 encoding of window titles. Set this
      resource to “true” to also set UTF-8 encoded title strings
      using the EWMH properties.
- This feature is available as a menu entry, since it is related to the
      particular applications you are running within xterm. You can also
      use a control sequence (see the discussion of “Title Modes”
      in Xterm Control Sequences), to set an equivalent flag (which can
      also be set using the titleModes resource).
- Xterm accepts either a keyword (ignoring case) or the number shown
      in parentheses:
  - false (0)
- Set only ISO-8859-1 title strings, e.g., using the ICCCM WM_NAME
      STRING property. The menu entry is enabled, allowing the choice of
      title-strings to be changed at runtime.
- true (1)
- Set both the EWMH (UTF-8 strings) and the ICCCM WM_NAME, etc. The
      menu entry is enabled, allowing the choice to be changed at runtime.
- always (2)
- Always set both the EWMH (UTF-8 strings) and the ICCCM WM_NAME,
      etc. This also disables the menu entry.
- default (3)
- At startup, the resource is set to true or false, according to the
      effective value of the utf8 resource.
 
  
  - The default is “default”.
  - utf8Weblike (class Utf8Weblike)
- Provide an alternate error-handling scheme for ill-formed UTF-8 as
      recommended in a W3C document. The Unicode standard does not require this
      for conformance. Some additional information can be found here:
    
  
https://invisible-island.net/xterm/bad-utf8/
  
  - The default is “false”.
  - veryBoldColors (class VeryBoldColors)
- Specifies whether to combine video attributes with colors specified by
      colorBD, colorBL, colorIT, colorRV, and
      colorUL. The resource value is the sum of values for each
      attribute:
1 for reverse,
2 for underline,
4 for bold,
8 for blink, and
512 for italic
 
  
  - The default is “0”.
  - visualBell (class VisualBell)
- Specifies whether or not a visible bell (i.e., flashing) should be used
      instead of an audible bell when Control-G is received. The default is
      “false”, which tells xterm to use an audible
    bell.
- visualBellDelay (class VisualBellDelay)
- Number of milliseconds to delay when displaying a visual bell. Default is
      100. If set to zero, no visual bell is displayed. This is useful for very
      slow displays, e.g., an LCD display on a laptop.
- visualBellLine (class VisualBellLine)
- Specifies whether to flash only the current line when displaying a visual
      bell rather than flashing the entire screen: The default is
      “false”, which tells xterm to flash the entire
      screen.
- vt100Graphics (class VT100Graphics)
- This specifies whether xterm will interpret VT100 graphic character
      escape sequences while in UTF-8 mode. This feature also applies to
      code-pages (e.g., for VT320 and VT520) and National Replacement Character
      Sets (VT220 and up), but not US-ASCII (the initially selected character
      set), to avoid conflict with UTF-8. The default is “true”,
      to provide support for various legacy applications.
- wideBoldFont (class WideBoldFont)
- This option specifies the font to be used for displaying bold wide text.
      By default, it will attempt to use a font twice as wide as the font that
      will be used to draw bold text. If no double-width font is found, it will
      improvise, by stretching the bold font.
- wideChars (class WideChars)
- Specifies if xterm should respond to control sequences that process
      16-bit characters. The default is “false”.
- wideFont (class WideFont)
- This option specifies the font to be used for displaying wide text. By
      default, it will attempt to use a font twice as wide as the font that will
      be used to draw normal text. If no double-width font is found, it will
      improvise, by stretching the normal font.
- ximFont (class XimFont)
- This option specifies the font to be used for displaying the preedit
      string in the “OverTheSpot” input method.
  
  - In “OverTheSpot” preedit type, the preedit (preconversion)
      string is displayed at the position of the cursor. It is the XIM server's
      responsibility to display the preedit string. The XIM client must inform
      the XIM server of the cursor position. For best results, the preedit
      string must be displayed with a proper font. Therefore, xterm
      informs the XIM server of the proper font. The font is be supplied by a
      "fontset", whose default value is “*”. This
      matches every font, the X library automatically chooses fonts with proper
      charsets. The ximFont resource is provided to override this default
      font setting.
The following resources are specified as part of the tek4014 widget
  (class Tek4014). These are specified by patterns such as
  “XTerm.tek4014.NAME”:
  - font2 (class Font)
- Specifies font number 2 to use in the Tektronix window.
- font3 (class Font)
- Specifies font number 3 to use in the Tektronix window.
- fontLarge (class Font)
- Specifies the large font to use in the Tektronix window.
- fontSmall (class Font)
- Specifies the small font to use in the Tektronix window.
- ginTerminator (class GinTerminator)
- Specifies what character(s) should follow a GIN report or status report.
      The possibilities are “none”, which sends no terminating
      characters, “CRonly”, which sends CR, and
      “CR&EOT”, which sends both CR and EOT. The default is
      “none”.
- height (class Height)
- Specifies the height of the Tektronix window in pixels.
- initialFont (class InitialFont)
- Specifies which of the four Tektronix fonts to use initially. Values are
      the same as for the set-tek-text action. The default is
      “large”.
- width (class Width)
- Specifies the width of the Tektronix window in pixels.
The resources that may be specified for the various menus are described in the
  documentation for the Athena SimpleMenu widget. The name and classes of
  the entries in each of the menus are listed below. Resources named
  “lineN” where N is a number are separators
  with class SmeLine.As with all X resource-based widgets, the labels mentioned are
    customary defaults for the application.
The Main Options menu (widget name mainMenu) has the
    following entries:
  - toolbar (class SmeBSB)
- This entry invokes the set-toolbar(toggle)
    action.
- securekbd (class SmeBSB)
- This entry invokes the secure() action.
- allowsends (class SmeBSB)
- This entry invokes the allow-send-events(toggle)
      action.
- redraw (class SmeBSB)
- This entry invokes the redraw() action.
- logging (class SmeBSB)
- This entry invokes the logging(toggle) action.
- print-immediate (class SmeBSB)
- This entry invokes the print-immediate() action.
- print-on-error (class SmeBSB)
- This entry invokes the print-on-error() action.
- print (class SmeBSB)
- This entry invokes the print() action.
- print-redir (class SmeBSB)
- This entry invokes the print-redir() action.
- dump-html (class SmeBSB)
- This entry invokes the dump-html() action.
- dump-svg (class SmeBSB)
- This entry invokes the dump-svg() action.
- 8-bit-control (class SmeBSB)
- This entry invokes the set-8-bit-control(toggle)
      action.
- backarrow key (class SmeBSB)
- This entry invokes the set-backarrow(toggle)
    action.
- num-lock (class SmeBSB)
- This entry invokes the set-num-lock(toggle)
    action.
- alt-esc (class SmeBSB)
- This entry invokes the alt-sends-escape(toggle)
      action.
- meta-esc (class SmeBSB)
- This entry invokes the meta-sends-escape(toggle)
      action.
- delete-is-del (class SmeBSB)
- This entry invokes the delete-is-del(toggle)
    action.
- oldFunctionKeys (class SmeBSB)
- This entry invokes the set-old-function-keys(toggle)
      action.
- hpFunctionKeys (class SmeBSB)
- This entry invokes the set-hp-function-keys(toggle)
      action.
- scoFunctionKeys (class SmeBSB)
- This entry invokes the set-sco-function-keys(toggle)
      action.
- sunFunctionKeys (class SmeBSB)
- This entry invokes the set-sun-function-keys(toggle)
      action.
- sunKeyboard (class SmeBSB)
- This entry invokes the sunKeyboard(toggle)
    action.
- suspend (class SmeBSB)
- This entry invokes the send-signal(tstp) action on
      systems that support job control.
- continue (class SmeBSB)
- This entry invokes the send-signal(cont) action on
      systems that support job control.
- interrupt (class SmeBSB)
- This entry invokes the send-signal(int) action.
- hangup (class SmeBSB)
- This entry invokes the send-signal(hup) action.
- terminate (class SmeBSB)
- This entry invokes the send-signal(term) action.
- kill (class SmeBSB)
- This entry invokes the send-signal(kill) action.
- quit (class SmeBSB)
- This entry invokes the quit() action.
The VT Options menu (widget name vtMenu) has the
    following entries:
  - scrollbar (class SmeBSB)
- This entry invokes the set-scrollbar(toggle)
    action.
- jumpscroll (class SmeBSB)
- This entry invokes the set-jumpscroll(toggle)
    action.
- reversevideo (class SmeBSB)
- This entry invokes the set-reverse-video(toggle)
      action.
- autowrap (class SmeBSB)
- This entry invokes the set-autowrap(toggle)
    action.
- reversewrap (class SmeBSB)
- This entry invokes the set-reversewrap(toggle)
      action.
- autolinefeed (class SmeBSB)
- This entry invokes the set-autolinefeed(toggle)
      action.
- appcursor (class SmeBSB)
- This entry invokes the set-appcursor(toggle)
    action.
- appkeypad (class SmeBSB)
- This entry invokes the set-appkeypad(toggle)
    action.
- scrollkey (class SmeBSB)
- This entry invokes the set-scroll-on-key(toggle)
      action.
- scrollttyoutput (class SmeBSB)
- This entry invokes the
      set-scroll-on-tty-output(toggle) action.
- allow132 (class SmeBSB)
- This entry invokes the set-allow132(toggle)
    action.
- cursesemul (class SmeBSB)
- This entry invokes the set-cursesemul(toggle)
    action.
- keepSelection (class SmeBSB)
- This entry invokes the set-keep-selection(toggle)
      action.
- selectToClipboard (class SmeBSB)
- This entry invokes the set-keep-clipboard(toggle)
      action.
- visualbell (class SmeBSB)
- This entry invokes the set-visual-bell(toggle)
      action.
- bellIsUrgent (class SmeBSB)
- This entry invokes the set-bellIsUrgent(toggle)
      action.
- poponbell (class SmeBSB)
- This entry invokes the set-pop-on-bell(toggle)
      action.
- cursorblink (class SmeBSB)
- This entry invokes the set-cursorblink(toggle)
      action.
- titeInhibit (class SmeBSB)
- This entry invokes the set-titeInhibit(toggle)
      action.
- activeicon (class SmeBSB)
- This entry toggles active icons on and off if this feature was compiled
      into xterm. It is enabled only if xterm was started with the
      command line option +ai or the activeIcon resource is set to
      “true”.
- softreset (class SmeBSB)
- This entry invokes the soft-reset() action.
- hardreset (class SmeBSB)
- This entry invokes the hard-reset() action.
- clearsavedlines (class SmeBSB)
- This entry invokes the clear-saved-lines() action.
- tekshow (class SmeBSB)
- This entry invokes the set-visibility(tek,toggle)
      action.
- tekmode (class SmeBSB)
- This entry invokes the set-terminal-type(tek)
    action.
- vthide (class SmeBSB)
- This entry invokes the set-visibility(vt,off)
    action.
- altscreen (class SmeBSB)
- This entry invokes the set-altscreen(toggle)
    action.
- sixelScrolling (class SmeBSB)
- This entry invokes the set-sixel-scrolling(toggle)
      action.
- privateColorRegisters (class SmeBSB)
- This entry invokes the set-private-colors(toggle)
      action.
The VT Fonts menu (widget name fontMenu) has the
    following entries:
  - fontdefault (class SmeBSB)
- This entry invokes the set-vt-font(d) action, setting
      the font using the font (default) resource, e.g.,
      “Default” in the menu.
- font1 (class SmeBSB)
- This entry invokes the set-vt-font(1) action, setting
      the font using the font1 resource, e.g., “Unreadable”
      in the menu.
- font2 (class SmeBSB)
- This entry invokes the set-vt-font(2) action, setting
      the font using the font2 resource, e.g., “Tiny” in
      the menu.
- font3 (class SmeBSB)
- This entry invokes the set-vt-font(3) action, setting
      the font using the font3 resource, e.g., “Small” in
      the menu.
- font4 (class SmeBSB)
- This entry invokes the set-vt-font(4) action, letting
      the font using the font4 resource, e.g., “Medium” in
      the menu.
- font5 (class SmeBSB)
- This entry invokes the set-vt-font(5) action, letting
      the font using the font5 resource, e.g., “Large” in
      the menu.
- font6 (class SmeBSB)
- This entry invokes the set-vt-font(6) action, letting
      the font using the font6 resource, e.g., “Huge” in
      the menu.
- font7 (class SmeBSB)
- This entry invokes the set-vt-font(7) action, letting
      the font using the font7 resource, e.g., “Enormous”
      in the menu.
- fontescape (class SmeBSB)
- This entry invokes the set-vt-font(e) action.
- fontsel (class SmeBSB)
- This entry invokes the set-vt-font(s) action.
- allow-bold-fonts (class SmeBSB)
- This entry invokes the allow-bold-fonts(toggle)
      action.
- font-linedrawing (class SmeBSB)
- This entry invokes the set-font-linedrawing(s)
      action.
- font-packed (class SmeBSB)
- This entry invokes the set-font-packed(s)
    action.
- font-doublesize (class SmeBSB)
- This entry invokes the set-font-doublesize(s)
    action.
- render-font (class SmeBSB)
- This entry invokes the set-render-font(s)
    action.
- utf8-fonts (class SmeBSB)
- This entry invokes the set-utf8-fonts(s) action.
- utf8-mode (class SmeBSB)
- This entry invokes the set-utf8-mode(s) action.
- utf8-title (class SmeBSB)
- This entry invokes the set-utf8-title(s) action.
- allow-color-ops (class SmeBSB)
- This entry invokes the allow-color-ops(toggle)
      action.
- allow-font-ops (class SmeBSB)
- This entry invokes the allow-fonts-ops(toggle)
      action.
- allow-tcap-ops (class SmeBSB)
- This entry invokes the allow-tcap-ops(toggle)
    action.
- allow-title-ops (class SmeBSB)
- This entry invokes the allow-title-ops(toggle)
      action.
- allow-window-ops (class SmeBSB)
- This entry invokes the allow-window-ops(toggle)
      action.
The Tek Options menu (widget name tekMenu) has the
    following entries:
  - tektextlarge (class SmeBSB)
- This entry invokes the set-tek-text(large)
    action.
- tektext2 (class SmeBSB)
- This entry invokes the set-tek-text(2) action.
- tektext3 (class SmeBSB)
- This entry invokes the set-tek-text(3) action.
- tektextsmall (class SmeBSB)
- This entry invokes the set-tek-text(small)
    action.
- tekpage (class SmeBSB)
- This entry invokes the tek-page() action.
- tekreset (class SmeBSB)
- This entry invokes the tek-reset() action.
- tekcopy (class SmeBSB)
- This entry invokes the tek-copy() action.
- vtshow (class SmeBSB)
- This entry invokes the set-visibility(vt,toggle)
      action.
- vtmode (class SmeBSB)
- This entry invokes the set-terminal-type(vt)
    action.
- tekhide (class SmeBSB)
- This entry invokes the set-visibility(tek,toggle)
      action.
The following resources are useful when specified for the Athena Scrollbar
  widget:
  - background (class Background)
- Specifies the color to use for the background of the scrollbar.
- foreground (class Foreground)
- Specifies the color to use for the foreground of the scrollbar.
- thickness (class Thickness)
- Specifies the width in pixels of the scrollbar (default: 14).
  
  - This may be overridden by the width resource.
  - thumb (class Thumb)
- The default “thumb” pixmap used for the scrollbar is a
      simple checkerboard pattern alternating pixels for foreground and
      background color.
- width (class Width)
- Specifies the width in pixels of the scrollbar (default: 0).
  
  - The widget checks the width resource first, using the
      thickness value if the width is zero.
Once the VTxxx window is created, xterm allows you to select text
  and copy it within the same or other windows using the pointer or the
  keyboard.A “pointer” could be a mouse, touchpad or similar
    device. X applications generally do not care, since they see only button
    events which have
  - position and
- button up/down state
Xterm can see these events as long as it has
  focus.
The keyboard also supplies events, but it is less flexible than
    the pointer for selecting/copying text.
Events are applied to actions using the
    translations resource. See Actions for a complete list, and
    Default Key Bindings for the built-in set of translations
    resources.
By default, the selection functions are invoked when the pointer buttons are
  used with no modifiers, and when they are used with the “shift”
  key. The “shift” key is special, because xterm uses that
  to ensure that selection functions are still available when it is programmed
  to send escape sequences in one of the mouse modes (see Xterm Control
  Sequences, as well as the resource disallowedMouseOps).
At startup, xterm inspects the translations resource
    to see which pointer buttons may be used in this way, and remembers these
    buttons when deciding whether to send escape sequences or perform selection
    when those buttons are used with the “shift” modifier. Other
    pointer buttons, e.g., typically those sent for wheel mouse events, are not
    affected.
The assignment of the functions described below to keys and
    buttons may be changed through the resource database; see Actions
    below.
  - Pointer button one (usually left)
- is used to save text into the cut buffer:
    
      
 
 
~Meta <Btn1Down>:select-start()
    
 
  
  - Move the cursor to beginning of the text, and then hold the button down
      while moving the cursor to the end of the region and releasing the button.
      The selected text is highlighted and is saved in the global cut
      buffer and made the selection when the button is released:
    
      
 
 
<BtnUp>:select-end(SELECT, CUT_BUFFER0) \n
    
 
- Normally (but see the discussion of on2Clicks, etc):
  - Double-clicking selects by words.
- Triple-clicking selects by lines.
- Quadruple-clicking goes back to characters, etc.
 
  
  - Multiple-click is determined by the time from button up to button down, so
      you can change the selection unit in the middle of a selection. Logical
      words and lines selected by double- or triple-clicking may wrap across
      more than one screen line if lines were wrapped by xterm itself
      rather than by the application running in the window. If the key/button
      bindings specify that an X selection is to be made, xterm will
      leave the selected text highlighted for as long as it is the selection
      owner.
  - Pointer button two (usually middle)
- “types” (pastes) the text from the given selection,
      if any, otherwise from the cut buffer, inserting it as keyboard input:
    
      
 
 
~Ctrl ~Meta <Btn2Up>:insert-selection(SELECT, CUT_BUFFER0)
    
 
- Pointer button three (usually right)
- extends the current selection.
    
      
 
 
~Ctrl ~Meta <Btn3Down>:start-extend()
    
 
  
  - (Without loss of generality, you can swap “right” and
      “left” everywhere in the rest of this paragraph.) If pressed
      while closer to the right edge of the selection than the left, it
      extends/contracts the right edge of the selection. If you contract the
      selection past the left edge of the selection, xterm assumes you
      really meant the left edge, restores the original selection, then
      extends/contracts the left edge of the selection. Extension starts in the
      selection unit mode that the last selection or extension was performed in;
      you can multiple-click to cycle through them.
By cutting and pasting pieces of text without trailing new lines,
    you can take text from several places in different windows and form a
    command to the shell, for example, or take output from a program and insert
    it into your favorite editor. Since cut buffers are globally shared among
    different applications, you may regard each as a “file” whose
    contents you know. The terminal emulator and other text programs should be
    treating it as if it were a text file, i.e., the text is delimited by new
    lines.
The scroll region displays the position and amount of text currently showing in
  the window (highlighted) relative to the amount of text actually saved. As
  more text is saved (up to the maximum), the size of the highlighted area
  decreases.
Clicking button one with the pointer in the scroll region moves
    the adjacent line to the top of the display window.
Clicking button three moves the top line of the display window
    down to the pointer position.
Clicking button two moves the display to a position in the saved
    text that corresponds to the pointer's position in the scrollbar.
Unlike the VTxxx window, the Tektronix window does not allow the copying
  of text. It does allow Tektronix GIN mode, and in this mode the cursor will
  change from an arrow to a cross. Pressing any key will send that key and the
  current coordinate of the cross cursor. Pressing button one, two, or three
  will return the letters “l”, “m”, and
  “r”, respectively. If the “shift” key is pressed
  when a pointer button is pressed, the corresponding upper case letter is sent.
  To distinguish a pointer button from a key, the high bit of the character is
  set (but this is bit is normally stripped unless the terminal mode is RAW; see
  tty(4) for details).
X clients provide select and paste support by responding to requests conveyed by
  the X server. The X server holds data in “atoms” which
  correspond to the different types of selection (PRIMARY,
  SECONDARY, CLIPBOARD) as well as the similar cut buffer
  mechanism (CUT_BUFFER0 to CUT_BUFFER7). Those are documented in
  the ICCCM.
The ICCCM deals with the underlying mechanism for select/paste. It
    does not mention highlighting. The selection is not the same
    as highlighting. Xterm (like many applications) uses
    highlighting to show you the currently selected text. An X application may
    own a selection, which allows it to be the source of data copied
    using a given selection atom Xterm may continue owning a selection
    after it stops highlighting (see keepSelection).
When configured to use the primary selection (the default), xterm can
  provide the selection data in ways which help to retain character encoding
  information as it is pasted.
The PRIMARY token is a standard X feature, documented in
    the ICCCM (Inter-Client Communication Conventions Manual), which
    states
The selection named by the atom PRIMARY is used for all
    commands that take only a single argument and is the principal means of
    communication between clients that use the selection mechanism.
 
A user “selects” text on xterm, which
    highlights the selected text. A subsequent “paste” to another
    client forwards a request to the client owning the selection. If
    xterm owns the primary selection, it makes the data available in the
    form of one or more “selection targets”. If it does not own
    the primary selection, e.g., if it has released it or another client has
    asserted ownership, it relies on cut-buffers to pass the data. But
    cut-buffers handle only ISO-8859-1 data (officially - some clients ignore
    the rules).
When configured to use the clipboard (using the selectToClipboard
  resource), the problem with persistence of ownership is bypassed. Otherwise,
  there is no difference regarding the data which can be passed via selection.
The selectToClipboard resource is a compromise, allowing
    CLIPBOARD to be treated almost like PRIMARY, unlike the ICCCM,
    which describes CLIPBOARD in different terms than PRIMARY or
    SECONDARY. Its lengthy explanation begins with the essential
  points:
The selection named by the atom CLIPBOARD is used to hold data
    that is being transferred between clients, that is, data that usually is
    being cut and then pasted or copied and then pasted. Whenever a client wants
    to transfer data to the clipboard:
  - It should assert ownership of the CLIPBOARD.
- If it succeeds in acquiring ownership, it should be prepared to respond to
      a request for the contents of the CLIPBOARD in the usual way (retaining
      the data to be able to return it). The request may be generated by the
      clipboard client described below.
 
However, many applications use CLIPBOARD in imitation of other windowing
  systems. The selectToClipboard resource (and corresponding menu entry
  Select to Clipboard) introduce the SELECT token (known only to
  xterm) which chooses between the PRIMARY and CLIPBOARD
  tokens.
Without using this feature, one can use workarounds such as the
    xclip program to show the contents of the X clipboard within an
    xterm window.
This is used less often than PRIMARY or CLIPBOARD. According to
  the ICCCM, it is used
  - As the second argument to commands taking two arguments (for example,
      “exchange primary and secondary selections”)
- As a means of obtaining data when there is a primary selection and the
      user does not want to disturb it
The different types of data which are passed depend on what the receiving client
  asks for. These are termed selection targets.When asking for the selection data, xterm tries the
    following types in this order:
  - UTF8_STRING
- This is an XFree86 extension, which denotes that the data is encoded in
      UTF-8. When xterm is built with wide-character support, it both
      accepts and provides this type.
- TEXT
- the text is in the encoding which corresponds to your current locale.
- COMPOUND_TEXT
- this is a format for multiple character set data, such as multi-lingual
      text. It can store UTF-8 data as a special case.
- STRING
- This is Latin 1 (ISO-8859-1) data.
 
The middle two (TEXT and COMPOUND_TEXT) are added if xterm
    is configured with the i18nSelections resource set to
    “true”.
UTF8_STRING is preferred (therefore first in the list) since
    xterm stores text as Unicode data when running in wide-character
    mode, and no translation is needed. On the other hand, TEXT and
    COMPOUND_TEXT may require translation. If the translation is incomplete,
    they will insert X's “defaultString” whose value cannot be
    set, and may simply be empty. Xterm's defaultString resource
    specifies the string to use for incomplete translations of the
  UTF8_STRING.
You can alter the types which xterm tries using the
    eightBitSelectTypes or utf8SelectTypes resources. For
    instance, you might have some specific locale setting which does not use
    UTF-8 encoding. The resource value is a comma-separated list of the
    selection targets, which consist of the names shown. You can use the special
    name I18N to denote the optional inclusion of TEXT and COMPOUND_TEXT. The
    names are matched ignoring case, and can be abbreviated. The default list
    can be expressed in several ways, e.g.,
UTF8_STRING,I18N,STRING
utf8,i18n,string
u,i,s
 
Applications can send escape sequences to xterm to cause it to send
  escape sequences back to the computer when you press a pointer button, or even
  (depending on which escape sequence) send escape sequences back to the
  computer as you move the pointer.
These escape sequences and the responses, called the mouse
    protocol, are documented in XTerm Control Sequences. They do not
    appear in the actions invoked by the translations resource
    because the resource does not change while you run xterm, whereas
    applications can change the mouse prototol (i.e., enable, disable, use
    different modes).
However, the mouse protocol is interpreted within the
    actions that are usually associated with the pointer buttons.
    Xterm ignores the mouse protocol in the insert-selection
    action if the shift-key is pressed at the same time. It also modifies a few
    other actions if the shift-key is pressed, e.g., suppressing the response
    with the pointer position, though not eliminating changes to the selected
    text.
Xterm has four menus, named mainMenu, vtMenu,
  fontMenu, and tekMenu. Each menu pops up under the correct
  combinations of key and button presses. Each menu is divided into sections,
  separated by a horizontal line. Some menu entries correspond to modes that can
  be altered. A check mark appears next to a mode that is currently active.
  Selecting one of these modes toggles its state. Other menu entries are
  commands; selecting one of these performs the indicated function.
All of the menu entries correspond to X actions. In the list
    below, the menu label is shown followed by the action's name in
  parenthesis.
The xterm mainMenu pops up when the “control” key
  and pointer button one are pressed in a window. This menu contains items that
  apply to both the VTxxx and Tektronix windows. There are several
  sections:
  - Commands for managing X events:
  - Toolbar (resource toolbar)
- Clicking on the “Toolbar” menu entry hides the toolbar if it
      is visible, and shows it if it is not.
- Secure Keyboard (resource securekbd)
- The Secure Keyboard mode is helpful when typing in passwords or
      other sensitive data in an unsecure environment (see SECURITY
      below, but read the limitations carefully).
- Allow SendEvents (resource allowsends)
- Specifies whether or not synthetic key and button events generated using
      the X protocol SendEvent request should be interpreted or discarded. This
      corresponds to the allowSendEvents resource.
- Redraw Window (resource redraw)
- Forces the X display to repaint; useful in some environments.
 
  - Commands for capturing output:
  - Log to File (resource logging)
- Captures text sent to the screen in a log file, as in the -l
      logging option.
- Print-All Immediately (resource
    print-immediate)
- Invokes the print-immediate action, sending the text of the current
      window directly to a file, as specified by the printFileImmediate,
      printModeImmediate and printOptsImmediate resources.
- Print-All on Error (resource
    print-on-error)
- Invokes the print-on-error action, which toggles a flag telling
      xterm that if it exits with an X error, to send the text of the
      current window directly to a file, as specified by the
      printFileOnXError, printModeOnXError and
      printOptsOnXError resources.
- Print Window (resource print)
- Sends the text of the current window to the program given in the
      printerCommand resource.
- Redirect to Printer (resource
    print-redir)
- This sets the printerControlMode to 0 or 2. You can use this to
      turn the printer on as if an application had sent the appropriate control
      sequence. It is also useful for switching the printer off if an
      application turns it on without resetting the print control mode.
- XHTML Screen Dump (resource dump-html)
- Available only when compiled with screen dump support. Invokes the
      dump-html action. This creates an XHTML file matching the contents
      of the current screen, including the border, internal border, colors and
      most attributes: bold, italic, underline, faint, strikeout, reverse; blink
      is rendered as white-on-red; double underline is rendered the same as
      underline since there is no portable equivalent in CSS 2.2.
  
  - The font is whatever your browser uses for preformatted (<pre>)
      elements. The XHTML file references a cascading style sheet (CSS) named
      “xterm.css” that you can create to select a font or
      override properties.
The following CSS selectors are used with the expected default
    behavior in the XHTML file:
.ul for underline,
  
  .bd for bold,
  
  .it for italic,
  
  .st for strikeout,
  
  .lu for strikeout combined with underline.
In addition you may use
.ev to affect even numbered lines and
  
  .od to affect odd numbered lines.
 
  
  - Attributes faint, reverse and blink are implemented as style
      attributes setting color properties. All colors are specified as RGB
      percentages in order to support displays with 10 bits per RGB.
- The name of the file will be
    
      
 
 
xterm.yyyy.MM.dd.hh.mm.ss.xhtml
    
 
- where yyyy, MM, dd, hh, mm and
      ss are the year, month, day, hour, minute and second when the
      screen dump was performed (the file is created in the directory
      xterm is started in, or the home directory for a login
      xterm).
- The dump-html action can also be triggered using the Media Copy
      control sequence CSI 1 0 i, for example from a shell script with
    
      
 
 
printf '\033[10i'
    
 Only the UTF-8 encoding is supported. 
  - SVG Screen Dump (resource dump-svg)
- Available only when compiled with screen dump support. Invokes the
      dump-svg action. This creates a Scalable Vector Graphics (SVG) file
      matching the contents of the current screen, including the border,
      internal border, colors and most attributes: bold, italic, underline,
      double underline, faint, strikeout, reverse; blink is rendered as
      white-on-red. The font is whatever your renderer uses for the
      monospace font-family. All colors are specified as RGB percentages
      in order to support displays with 10 bits per RGB.
  
  - The name of the file will be
    
      
 
 
xterm.yyyy.MM.dd.hh.mm.ss.svg
    
 
- where yyyy, MM, dd, hh, mm and
      ss are the year, month, day, hour, minute and second when the
      screen dump was performed (the file is created in the directory
      xterm is started in, or the home directory for a login
      xterm).
- The dump-svg action can also be triggered using the Media Copy
      control sequence CSI 1 1 i, for example from a shell script with
    
      
 
 
printf '\033[11i'
    
 Only the UTF-8 encoding is supported. 
 
  - Modes for setting keyboard style:
  - 8-Bit Controls (resource 8-bit-control)
- Enabled for VT220 emulation, this controls whether xterm will send
      8-bit control sequences rather than using 7-bit (ASCII) controls, e.g.,
      sending a byte in the range 128–159 rather than the escape
      character followed by a second byte. Xterm always interprets both
      8-bit and 7-bit control sequences (see Xterm Control Sequences).
      This corresponds to the eightBitControl resource.
- Backarrow Key (BS/DEL) (resource
    backarrow key)
- Modifies the behavior of the backarrow key, making it transmit either a
      backspace (8) or delete (127) character. This corresponds to the
      backarrowKey resource.
- Alt/NumLock Modifiers (resource num-lock)
- Controls the treatment of Alt- and NumLock-key modifiers. This corresponds
      to the numLock resource.
- Meta Sends Escape (resource meta-esc)
- Controls whether Meta keys are converted into a two-character
      sequence with the character itself preceded by ESC. This corresponds to
      the metaSendsEscape resource.
- Delete is DEL (resource delete-is-del)
- Controls whether the Delete key on the editing keypad should send DEL
      (127) or the VT220-style Remove escape sequence. This corresponds to the
      deleteIsDEL resource.
- Old Function-Keys (resource
    oldFunctionKeys)
- HP Function-Keys (resource
    hpFunctionKeys)
- SCO Function-Keys (resource
    scoFunctionKeys)
- Sun Function-Keys (resource
    sunFunctionKeys)
- VT220 Keyboard (resource sunKeyboard)
- These act as a radio-button, selecting one style for the keyboard layout.
      The layout corresponds to more than one resource setting:
      sunKeyboard, sunFunctionKeys, scoFunctionKeys and
      hpFunctionKeys.
 
  - Commands for process signalling:
  - Send STOP Signal (resource suspend)
- Send CONT Signal (resource continue)
- Send INT Signal (resource interrupt)
- Send HUP Signal (resource hangup)
- Send TERM Signal (resource terminate)
- Send KILL Signal (resource kill)
- These send the SIGTSTP, SIGCONT, SIGINT, SIGHUP, SIGTERM and SIGKILL
      signals respectively, to the process group of the process running under
      xterm (usually the shell). The SIGCONT function is
      especially useful if the user has accidentally typed CTRL-Z, suspending
      the process.
- Quit (resource quit)
- Stop processing X events except to support the -hold option, and
      then send a SIGHUP signal to the process group of the process running
      under xterm (usually the shell).
 
The xterm vtMenu sets various modes in the VTxxx emulation,
  and is popped up when the “control” key and pointer button two
  are pressed in the VTxxx window.
  - VTxxx Modes:
  - Enable Scrollbar (resource scrollbar)
- Enable (or disable) the scrollbar. This corresponds to the -sb
      option and the scrollBar resource.
- Enable Jump Scroll (resource jumpscroll)
- Enable (or disable) jump scrolling. This corresponds to the -j
      option and the jumpScroll resource.
- Enable Reverse Video (resource
    reversevideo)
- Enable (or disable) reverse-video. This corresponds to the -rv
      option and the reverseVideo resource.
- Enable Auto Wraparound (resource
    autowrap)
- Enable (or disable) auto-wraparound. This corresponds to the -aw
      option and the autoWrap resource.
- Enable Reverse Wraparound (resource
    reversewrap)
- Enable (or disable) reverse wraparound. This corresponds to the -rw
      option and the reverseWrap resource.
- Enable Auto Linefeed (resource
    autolinefeed)
- Enable (or disable) auto-linefeed. This is the VT102 NEL function, which
      causes the emulator to emit a line feed after each carriage return. There
      is no corresponding command-line option or resource setting.
- Enable Application Cursor Keys (resource
    appcursor)
- Enable (or disable) application cursor keys. This corresponds to the
      appcursorDefault resource. There is no corresponding command-line
      option.
- Enable Application Keypad (resource
    appkeypad)
- Enable (or disable) application keypad keys. This corresponds to the
      appkeypadDefault resource. There is no corresponding command-line
      option.
- Scroll to Bottom on Key Press (resource
    scrollkey)
- Enable (or disable) scrolling to the bottom of the scrolling region on a
      keypress. This corresponds to the -sk option and the
      scrollKey resource.
  
  - As a special case, the XON / XOFF keys (control/S and control/Q) are
      ignored.
  - Scroll to Bottom on Tty Output (resource
    scrollttyoutput)
- Enable (or disable) scrolling to the bottom of the scrolling region on
      output to the terminal. This corresponds to the -si option and the
      scrollTtyOutput resource.
- Allow 80/132 Column Switching (resource
    allow132)
- Enable (or disable) switching between 80 and 132 columns. This corresponds
      to the -132 option and the c132 resource.
- Keep Selection (resource keepSelection)
- Tell xterm whether to disown the selection when it stops
      highlighting it, e.g., when an application modifies the display so that it
      no longer matches the text which has been highlighted. As long as
      xterm continues to own the selection for a given atom, it can
      provide the corresponding text to other clients which request the
      selection using that atom.
  
  - This corresponds to the keepSelection resource. There is no
      corresponding command-line option.
- Telling xterm to not disown the selection does not prevent other
      applications from taking ownership of the selection. When that happens,
      xterm receives notification that this has happened, and removes its
      highlighting.
- See SELECT/PASTE for more information.
  - Select to Clipboard (resource
    selectToClipboard)
- Tell xterm whether to use the PRIMARY or CLIPBOARD
      for SELECT tokens in the translations resource which maps
      keyboard and mouse actions to select/paste actions.
  
  - This corresponds to the selectToClipboard resource. There is no
      corresponding command-line option.
- The keepSelection resource setting applies to CLIPBOARD
      selections just as it does for PRIMARY selections. However some
      window managers treat the clipboard specially. For instance, XQuartz's
      synchronization between the OSX pasteboard and the X11
      clipboard causes applications to lose the selection ownership for
      that atom when a selection is copied to the clipboard.
- See SELECT/PASTE for more information.
  - Enable Visual Bell (resource visualbell)
- Enable (or disable) visible bell (i.e., flashing) instead of an audible
      bell. This corresponds to the -vb option and the visualBell
      resource.
- Enable Bell Urgency (resource
    bellIsUrgent)
- Enable (or disable) Urgency window manager hint when Control-G is
      received. This corresponds to the bellIsUrgent resource.
- Enable Pop on Bell (resource poponbell)
- Enable (or disable) raising of the window when Control-G is received. This
      corresponds to the -pop option and the popOnBell
    resource.
- Enable Blinking Cursor (resource
    cursorblink)
- Enable (or disable) the blinking-cursor feature. This corresponds to the
      -bc option and the cursorBlink resource. There are also
      escape sequences (see Xterm Control Sequences):
  - If the cursorBlinkXOR resource is set, the menu entry and the
      escape sequence states will be XOR'd: if both are enabled, the cursor will
      not blink, if only one is enabled, the cursor will blink.
- If the cursorBlinkXOR is not set; if either the menu entry or the
      escape sequence states are set, the cursor will blink.
 
  
  - In either case, the checkbox for the menu shows the state of the
      cursorBlink resource, which may not correspond to what the cursor
      is actually doing.
  - Enable Alternate Screen Switching (resource
    titeInhibit)
- Enable (or disable) switching between the normal and alternate screens.
      This corresponds to the titeInhibit resource. There is no
      corresponding command-line option.
- Enable Active Icon (resource activeicon)
- Enable (or disable) the active-icon feature. This corresponds to the
      -ai option and the activeIcon resource.
- Sixel Scrolling (resource sixelScrolling)
- When enabled, sixel graphics are positioned at the current text cursor
      location, scroll the image vertically if larger than the screen, and leave
      the text cursor at the start of the next complete line after the image
      when returning to text mode (this is the default). When disabled, sixel
      graphics are positioned at the upper left of the screen, are cropped to
      fit the screen, and do not affect the text cursor location. This
      corresponds to the sixelScrolling resource. There is no
      corresponding command-line option.
- Private Color Registers (resource
    privateColorRegisters)
- If xterm is configured to support ReGIS graphics, this controls
      whether a private color palette can be used.
  
  - When enabled, each graphic image uses a separate set of color registers,
      so that it essentially has a private palette (this is the default). If it
      is not set, all graphics images share a common set of registers which is
      how sixel and ReGIS graphics worked on actual hardware. The default is
      likely a more useful mode on modern TrueColor hardware.
- This corresponds to the privateColorRegisters resource. There is no
      corresponding command-line option.
 
  - VTxxx Commands:
  - Do Soft Reset (resource softreset)
- Reset scroll regions. This can be convenient when some program has left
      the scroll regions set incorrectly (often a problem when using VMS or
      TOPS-20). This corresponds to the VT220 DECSTR control sequence.
- Do Full Reset (resource hardreset)
- The full reset entry will clear the screen, reset tabs to every eight
      columns, and reset the terminal modes (such as wrap and smooth scroll) to
      their initial states just after xterm has finished processing the
      command line options. This corresponds to the VT102 RIS control sequence,
      with a few obvious differences. For example, your session is not
      disconnected as a real VT102 would do.
- Reset and Clear Saved Lines (resource
    clearsavedlines)
- Perform a full reset, and also clear the saved lines.
 
  - Commands for setting the current screen:
  - Show Tek Window (resource tekshow)
- When enabled, pops the Tektronix 4014 window up (makes it visible). When
      disabled, hides the Tektronix 4014 window.
- Switch to Tek Mode (resource tekmode)
- When enabled, pops the Tektronix 4014 window up if it is not already
      visible, and switches the input stream to that window. When disabled,
      hides the Tektronix 4014 window and switches input back to the
      VTxxx window.
- Hide VT Window (resource vthide)
- When enabled, hides the VTxxx window, shows the Tektronix 4014
      window if it was not already visible and switches the input stream to that
      window. When disabled, shows the VTxxx window, and switches the
      input stream to that window.
- Show Alternate Screen (resource
    altscreen)
- When enabled, shows the alternate screen. When disabled, shows the normal
      screen. Note that the normal screen may have saved lines; the alternate
      screen does not.
 
The xterm fontMenu pops up when the “control” key
  and pointer button three are pressed in a window. It sets the font used in the
  VTxxx window, or modifies the way the font is specified or displayed.
  There are several sections.
The first section allows you to select the font from a set of
    alternatives:
  - Default (resource fontdefault)
- Set the font to the default, i.e., that given by the *VT100.font
      resource.
- Unreadable (resource font1)
- Set the font to that given by the *VT100.font1 resource.
- Tiny (resource font2)
- Set the font to that given by the *VT100.font2 resource.
- Small (resource font3)
- Set the font to that given by the *VT100.font3 resource.
- Medium (resource font4)
- Set the font to that given by the *VT100.font4 resource.
- Large (resource font5)
- Set the font to that given by the *VT100.font5 resource.
- Huge (resource font6)
- Set the font to that given by the *VT100.font6 resource.
- Enormous (resource font7)
- Set the font to that given by the *VT100.font7 resource.
- Escape Sequence (resource fontescape)
- This allows you to set the font last specified by the Set Font escape
      sequence (see Xterm Control Sequences).
- Selection (resource fontsel)
- This allows you to set the font specified the current selection as a font
      name (if the PRIMARY selection is owned).
 
The second section allows you to modify the way it is
  displayed:
  - Bold Fonts (resource allow-bold-fonts)
- This is normally checked (enabled). When unchecked, xterm will not
      use bold fonts. The setting corresponds to the allowBoldFonts
      resource.
- Line-Drawing Characters (resource
    font-linedrawing)
- When set, tells xterm to draw its own line-drawing characters.
      Otherwise it relies on the font containing these. Compare to the
      forceBoxChars resource.
- Packed Font (resource font-packed)
- When set, tells xterm to use the minimum glyph-width from a font
      when displaying characters. Use the maximum width (unchecked) to help
      display proportional fonts. Compare to the forcePackedFont
      resource.
- Doublesized Characters (resource
    font-doublesize)
- When set, xterm may ask the font server to produce scaled versions
      of the normal font, for VT102 double-size characters.
 
The third section allows you to modify the way it is
  specified:
  - TrueType Fonts (resource render-font)
- If the renderFont and corresponding resources were set, this is a
      further control whether xterm will actually use the Xft library
      calls to obtain a font.
- UTF-8 Encoding (resource utf8-mode)
- This controls whether xterm uses UTF-8 encoding of input/output. It
      is useful for temporarily switching xterm to display text from an
      application which does not follow the locale settings. It corresponds to
      the utf8 resource.
- UTF-8 Fonts (resource utf8-fonts)
- This controls whether xterm uses UTF-8 fonts for display. It is
      useful for temporarily switching xterm to display text from an
      application which does not follow the locale settings. It combines the
      utf8 and utf8Fonts resources, subject to the locale
      resource.
- UTF-8 Titles (resource utf8-title)
- This controls whether xterm accepts UTF-8 encoding for title
      control sequences. It corresponds to the utf8Fonts resource.
  
  - Initially the checkmark is set according to both the utf8 and
      utf8Fonts resource values. If the latter is set to
      “always”, the checkmark is disabled. Likewise, if there are
      no fonts given in the utf8Fonts subresources, then the checkmark
      also is disabled.
- The standard XTerm app-defaults file defines both sets of fonts,
      while the UXTerm app-defaults file defines only one set. Assuming
      the standard app-defaults files, this command will launch xterm
      able to switch between UTF-8 and ISO-8859-1 encoded fonts:
    
      
 
 
uxterm -class XTerm
    
 
 
The fourth section allows you to enable or disable special
    operations which can be controlled by writing escape sequences to the
    terminal. These are disabled if the SendEvents feature is enabled:
  - Allow Color Ops (resource allow-font-ops)
- This corresponds to the allowColorOps resource. Enable or disable
      control sequences that set/query the colors.
- Allow Font Ops (resource allow-font-ops)
- This corresponds to the allowFontOps resource. Enable or disable
      control sequences that set/query the font.
- Allow Mouse Ops (resource
    allow-mouse-ops)
- Enable or disable control sequences that cause the terminal to send escape
      sequences on pointer-clicks and movement. This corresponds to the
      allowMouseOps resource.
- Allow Tcap Ops (resource allow-tcap-ops)
- Enable or disable control sequences that query the terminal's notion of
      its function-key strings, as termcap or terminfo capabilities. This
      corresponds to the allowTcapOps resource.
- Allow Title Ops (resource
    allow-title-ops)
- Enable or disable control sequences that modify the window title or icon
      name. This corresponds to the allowTitleOps resource.
- Allow Window Ops (resource
    allow-window-ops)
- Enable or disable extended window control sequences (as used in dtterm).
      This corresponds to the allowWindowOps resource.
 
The xterm tekMenu sets various modes in the Tektronix emulation,
  and is popped up when the “control” key and pointer button two
  are pressed in the Tektronix window. The current font size is checked in the
  modes section of the menu.
  - Large Characters (resource tektextlarge)
- #2 Size Characters (resource tektext2)
- #3 Size Characters (resource tektext3)
- Small Characters (resource tektextsmall)
 
Commands:
  - PAGE (resource tekpage)
- Simulates the Tektronix “PAGE” button by
  - clearing the window,
- cancelling the graphics input-mode, and
- moving the cursor to the home position.
 
  - RESET (resource tekreset)
- Unlike the similarly-named Tektronix “RESET” button, this
      does everything that PAGE does as well as resetting the line-type
      and font-size to their default values.
- COPY (resource tekcopy)
- Simulates the Tektronix “COPY” button (which makes a
      hard-copy of the screen) by writing the information to a text file.
 
Windows:
  - Show VT Window (resource vtshow)
- Switch to VT Mode (resource vtmode)
- Hide Tek Window (resource tekhide)
 
X environments differ in their security consciousness.
  - Most servers, run under xdm, are capable of using a “magic
      cookie” authorization scheme that can provide a reasonable level of
      security for many people. If your server is only using a host-based
      mechanism to control access to the server (see xhost(1)), then if
      you enable access for a host and other users are also permitted to run
      clients on that same host, it is possible that someone can run an
      application which uses the basic services of the X protocol to snoop on
      your activities, potentially capturing a transcript of everything you type
      at the keyboard.
- Any process which has access to your X display can manipulate it in ways
      that you might not anticipate, even redirecting your keyboard to itself
      and sending events to your application's windows. This is true even with
      the “magic cookie” authorization scheme. While the
      allowSendEvents provides some protection against rogue applications
      tampering with your programs, guarding against a snooper is harder.
- The X input extension for instance allows an application to bypass all of
      the other (limited) authorization and security features, including the
      GrabKeyboard protocol.
- The possibility of an application spying on your keystrokes is of
      particular concern when you want to type in a password or other sensitive
      data. The best solution to this problem is to use a better authorization
      mechanism than is provided by X.
Subject to all of these caveats, a simple mechanism exists for
    protecting keyboard input in xterm.
The xterm menu (see MENUS above) contains a
    Secure Keyboard entry which, when enabled, attempts to ensure that
    all keyboard input is directed only to xterm (using the
    GrabKeyboard protocol request). When an application prompts you for a
    password (or other sensitive data), you can enable Secure Keyboard
    using the menu, type in the data, and then disable Secure Keyboard
    using the menu again.
  - This ensures that you know which window is accepting your keystrokes.
- It cannot ensure that there are no processes which have access to your X
      display that might be observing the keystrokes as well.
Only one X client at a time can grab the keyboard, so when you
    attempt to enable Secure Keyboard it may fail. In this case, the bell
    will sound. If the Secure Keyboard succeeds, the foreground and
    background colors will be exchanged (as if you selected the Enable
    Reverse Video entry in the Modes menu); they will be exchanged
    again when you exit secure mode. If the colors do not switch, then
    you should be very suspicious that you are being spoofed. If the
    application you are running displays a prompt before asking for the
    password, it is safest to enter secure mode before the prompt gets
    displayed, and to make sure that the prompt gets displayed correctly (in the
    new colors), to minimize the probability of spoofing. You can also bring up
    the menu again and make sure that a check mark appears next to the
  entry.
Secure Keyboard mode will be disabled automatically if your
    xterm window becomes iconified (or otherwise unmapped), or if you
    start up a reparenting window manager (that places a title bar or other
    decoration around the window) while in Secure Keyboard mode. (This is
    a feature of the X protocol not easily overcome.) When this happens, the
    foreground and background colors will be switched back and the bell will
    sound in warning.
Clicking the left pointer button twice in rapid succession (double-clicking)
  causes all characters of the same class (e.g., letters, white space,
  punctuation) to be selected as a “word”. Since different people
  have different preferences for what should be selected (for example, should
  filenames be selected as a whole or only the separate subnames), the default
  mapping can be overridden through the use of the charClass (class
  CharClass) resource.
This resource is a series of comma-separated
    range:value pairs.
  - The range is either a single number or low-high in
      the range of 0 to 65535, corresponding to the code for the character or
      characters to be set.
- The value is arbitrary. For example, the default table uses the
      character number of the first character occurring in the set. When not in
      UTF-8 mode, only the first 256 entries of this table will be used.
The default table starts as follows -
  
static int charClass[256] = {
/* NUL  SOH  STX  ETX  EOT  ENQ  ACK  BEL */
    32,   1,   1,   1,   1,   1,   1,   1,
/*  BS   HT   NL   VT   NP   CR   SO   SI */
     1,  32,   1,   1,   1,   1,   1,   1,
/* DLE  DC1  DC2  DC3  DC4  NAK  SYN  ETB */
     1,   1,   1,   1,   1,   1,   1,   1,
/* CAN   EM  SUB  ESC   FS   GS   RS   US */
     1,   1,   1,   1,   1,   1,   1,   1,
/*  SP    !    "    #    $    %    &    ' */
    32,  33,  34,  35,  36,  37,  38,  39,
/*   (    )    *    +    ,    -    .    / */
    40,  41,  42,  43,  44,  45,  46,  47,
/*   0    1    2    3    4    5    6    7 */
    48,  48,  48,  48,  48,  48,  48,  48,
/*   8    9    :    ;    <    =    >    ? */
    48,  48,  58,  59,  60,  61,  62,  63,
/*   @    A    B    C    D    E    F    G */
    64,  48,  48,  48,  48,  48,  48,  48,
/*   H    I    J    K    L    M    N    O */
    48,  48,  48,  48,  48,  48,  48,  48,
/*   P    Q    R    S    T    U    V    W */
    48,  48,  48,  48,  48,  48,  48,  48,
/*   X    Y    Z    [    \    ]    ^    _ */
    48,  48,  48,  91,  92,  93,  94,  48,
/*   `    a    b    c    d    e    f    g */
    96,  48,  48,  48,  48,  48,  48,  48,
/*   h    i    j    k    l    m    n    o */
    48,  48,  48,  48,  48,  48,  48,  48,
/*   p    q    r    s    t    u    v    w */
    48,  48,  48,  48,  48,  48,  48,  48,
/*   x    y    z    {    |    }    ~  DEL */
    48,  48,  48, 123, 124, 125, 126,   1,
/* x80  x81  x82  x83  IND  NEL  SSA  ESA */
     1,   1,   1,   1,   1,   1,   1,   1,
/* HTS  HTJ  VTS  PLD  PLU   RI  SS2  SS3 */
     1,   1,   1,   1,   1,   1,   1,   1,
/* DCS  PU1  PU2  STS  CCH   MW  SPA  EPA */
     1,   1,   1,   1,   1,   1,   1,   1,
/* x98  x99  x9A  CSI   ST  OSC   PM  APC */
     1,   1,   1,   1,   1,   1,   1,   1,
/*   -    i   c/    L   ox   Y-    |   So */
   160, 161, 162, 163, 164, 165, 166, 167,
/*  ..   c0   ip   <<    _        R0    - */
   168, 169, 170, 171, 172, 173, 174, 175,
/*   o   +-    2    3    '    u   q|    . */
   176, 177, 178, 179, 180, 181, 182, 183,
/*   ,    1    2   >>  1/4  1/2  3/4    ? */
   184, 185, 186, 187, 188, 189, 190, 191,
/*  A`   A'   A^   A~   A:   Ao   AE   C, */
    48,  48,  48,  48,  48,  48,  48,  48,
/*  E`   E'   E^   E:   I`   I'   I^   I: */
    48,  48,  48,  48,  48,  48,  48,  48,
/*  D-   N~   O`   O'   O^   O~   O:    X */
    48,  48,  48,  48,  48,  48,  48, 215,
/*  O/   U`   U'   U^   U:   Y'    P    B */
    48,  48,  48,  48,  48,  48,  48,  48,
/*  a`   a'   a^   a~   a:   ao   ae   c, */
    48,  48,  48,  48,  48,  48,  48,  48,
/*  e`   e'   e^   e:   i`   i'   i^   i: */
    48,  48,  48,  48,  48,  48,  48,  48,
/*   d   n~   o`   o'   o^   o~   o:   -: */
    48,  48,  48,  48,  48,  48,  48, 247,
/*  o/   u`   u'   u^   u:   y'    P   y: */
    48,  48,  48,  48,  48,  48,  48,  48};
  
  - For example, the string “33:48,37:48,45-47:48,38:48”
      indicates that the exclamation mark, percent sign, dash, period, slash,
      and ampersand characters should be treated the same way as characters and
      numbers. This is useful for cutting and pasting electronic mailing
      addresses and filenames.
It is possible to rebind keys (or sequences of keys) to arbitrary strings for
  input, by changing the translations resources for the vt100 or tek4014
  widgets. Changing the translations resource for events other than key
  and button events is not expected, and will cause unpredictable behavior.
The following actions are provided for use within the vt100 or
  tek4014 translations resources:
  - allow-bold-fonts(on/off/toggle)
- This action sets, unsets or toggles the allowBoldFonts resource and
      is also invoked by the allow-bold-fonts entry in
    fontMenu.
- allow-color-ops(on/off/toggle)
- This action sets, unsets or toggles the allowColorOps resource and
      is also invoked by the allow-color-ops entry in
    fontMenu.
- allow-font-ops(on/off/toggle)
- This action sets, unsets or toggles the allowFontOps resource and
      is also invoked by the allow-font-ops entry in
    fontMenu.
- allow-mouse-ops(on/off/toggle)
- This action sets, unsets or toggles the allowMousepOps resource and
      is also invoked by the allow-mouse-ops entry in
    fontMenu.
- allow-send-events(on/off/toggle)
- This action sets, unsets or toggles the allowSendEvents resource
      and is also invoked by the allowsends entry in
    mainMenu.
- allow-tcap-ops(on/off/toggle)
- This action sets, unsets or toggles the allowTcapOps resource and
      is also invoked by the allow-tcap-ops entry in
    fontMenu.
- allow-title-ops(on/off/toggle)
- This action sets, unsets or toggles the allowTitleOps resource and
      is also invoked by the allow-title-ops entry in
    fontMenu.
- allow-window-ops(on/off/toggle)
- This action sets, unsets or toggles the allowWindowOps resource and
      is also invoked by the allow-window-ops entry in
    fontMenu.
- alt-sends-escape()
- This action toggles the state of the altSendsEscape resource.
- bell([percent])
- This action rings the keyboard bell at the specified percentage above or
      below the base volume.
- clear-saved-lines()
- This action does hard-reset() and also clears the history of lines
      saved off the top of the screen. It is also invoked from the
      clearsavedlines entry in vtMenu. The effect is identical to
      a hardware reset (RIS) control sequence.
- copy-selection(destname [, ...])
- This action puts the currently selected text into all of the selections or
      cutbuffers specified by destname. Unlike select-end, it does
      not send a mouse position or otherwise modify the internal selection
      state.
- create-menu(m/v/f/t)
- This action creates one of the menus used by xterm, if it has not
      been previously created. The parameter values are the menu names:
      mainMenu, vtMenu, fontMenu, tekMenu,
      respectively.
- dabbrev-expand()
- Expands the word before cursor by searching in the preceding text on the
      screen and in the scrollback buffer for words starting with that
      abbreviation. Repeating dabbrev-expand() several times in sequence
      searches for an alternative expansion by looking farther back. Lack of
      more matches is signaled by a bell. Attempts to expand an empty word
      (i.e., when cursor is preceded by a space) yield successively all previous
      words. Consecutive identical expansions are ignored. The word here is
      defined as a sequence of non-whitespace characters. This feature partially
      emulates the behavior of “dynamic abbreviation” expansion in
      Emacs (bound there to M-/). Here is a resource setting for xterm
      which will do the same thing:
    
      
 
 
*VT100*translations:    #override \n\
        Meta <KeyPress> /:dabbrev-expand()
    
 
- deiconify()
- Changes the window state back to normal, if it was iconified.
- delete-is-del()
- This action toggles the state of the deleteIsDEL resource.
- dired-button()
- Handles a button event (other than press and release) by echoing the
      event's position (i.e., character line and column) in the following
      format:
    
      
 
 
^X ESC G <line+“ ”> <col+“ ”>
    
 
- dump-html()
- Invokes the XHTML Screen Dump feature.
- dump-svg()
- Invokes the SVG Screen Dump feature.
- exec-formatted(format, sourcename [, ...])
- Execute an external command, using the current selection for part of the
      command's parameters. The first parameter, format gives the basic
      command. Succeeding parameters specify the selection source as in
      insert-selection.
  
  - The format parameter allows these substitutions:
  - %%
- inserts a "%".
- %P
- the screen-position at the beginning of the highlighted region, as a
      semicolon-separated pair of integers using the values that the CUP control
      sequence would use.
- %p
- the screen-position after the beginning of the highlighted region, using
      the same convention as “%P”.
- %S
- the length of the string that “%s” would insert.
- %s
- the content of the selection, unmodified.
- %T
- the length of the string that “%t” would insert.
- %t
- the selection, trimmed of leading/trailing whitespace. Embedded spaces
      (and newlines) are copied as is.
- %R
- the length of the string that “%r” would insert.
- %r
- the selection, trimmed of trailing whitespace.
- %V
- the video attributes at the beginning of the highlighted region, as a
      semicolon-separated list of integers using the values that the SGR control
      sequence would use.
- %v
- the video attributes after the end of the highlighted region, using the
      same convention as “%V”.
 
  
  - After constructing the command-string, xterm forks a subprocess and
      executes the command, which completes independently of xterm.
- For example, this translation would invoke a new xterm process to
      view a file whose name is selected while holding the shift key down. The
      new process is started when the mouse button is released:
    
      
 
 
*VT100*translations: #override Shift \
    <Btn1Up>:exec-formatted("xterm -e view '%t'", SELECT)
    
 
  - exec-selectable(format, onClicks)
- Execute an external command, using data copied from the screen for part of
      the command's parameters. The first parameter, format gives the
      basic command as in exec-formatted. The second parameter specifies
      the method for copying the data as in the on2Clicks resource.
- fullscreen(on/off/toggle)
- This action sets, unsets or toggles the fullscreen resource.
- hard-reset()
- This action resets the scrolling region, tabs, window size, and cursor
      keys and clears the screen. It is also invoked from the hardreset
      entry in vtMenu.
- iconify()
- Iconifies the window.
- ignore()
- This action ignores the event but checks for special pointer position
      escape sequences.
- insert()
- This action inserts the character or string associated with the key that
      was pressed.
- insert-eight-bit()
- This action inserts an eight-bit (Meta) version of the character or string
      associated with the key that was pressed. Only single-byte values are
      treated specially. The exact action depends on the value of the
      altSendsEscape and the metaSendsEscape and the
      eightBitInput resources. The metaSendsEscape resource is
      tested first. See the eightBitInput resource for a full
    discussion.
  
  - The term “eight-bit” is misleading: xterm checks if
      the key is in the range 128 to 255 (the eighth bit is set). If the value
      is in that range, depending on the resource values, xterm may then
      do one of the following:
  - add 128 to the value, setting its eighth bit,
- send an ESC byte before the key, or
- send the key unaltered.
 
  - insert-formatted(format, sourcename [, ...])
- Insert the current selection or data related to it, formatted. The first
      parameter, format gives the template for the data as in
      exec-formatted. Succeeding parameters specify the selection source
      as in insert-selection.
- insert-selectable(format, onClicks)
- Insert data copied from the screen, formatted. The first parameter,
      format gives the template for the data as in exec-formatted.
      The second parameter specifies the method for copying the data as in the
      on2Clicks resource.
- insert-selection(sourcename [, ...])
- This action inserts the string found in the selection or cutbuffer
      indicated by sourcename. Sources are checked in the order given
      (case is significant) until one is found. Commonly-used selections
      include: PRIMARY, SECONDARY, and CLIPBOARD. Cut
      buffers are typically named CUT_BUFFER0 through
    CUT_BUFFER7.
- insert-seven-bit()
- This action is a synonym for insert(). The term
      “seven-bit” is misleading: it only implies that xterm
      does not try to add 128 to the key's value as in
      insert-eight-bit().
- interpret(control-sequence)
- Interpret the given control sequence locally, i.e., without passing it to
      the host. This works by inserting the control sequence at the front of the
      input buffer. Use “\” to escape octal digits in the string.
      Xt does not allow you to put a null character (i.e., “\000”)
      in the string.
- keymap(name)
- This action dynamically defines a new translation table whose resource
      name is name with the suffix “Keymap” (i.e.,
      nameKeymap, where case is significant). The name None
      restores the original translation table.
- larger-vt-font()
- Set the font to the next larger one, based on the font dimensions. See
      also set-vt-font().
- load-vt-fonts(name[,class])
- Load fontnames from the given subresource name and class. That is, load
      the “*VT100.name.font”, resource as
      “*VT100.font” etc. If no name is given, the original set of
      fontnames is restored.
  
  - Unlike set-vt-font(), this does not affect the escape- and
      select-fonts, since those are not based on resource values. It does affect
      the fonts loosely organized under the “Default” menu entry,
      including font, boldFont, wideFont and
      wideBoldFont.
  - maximize()
- Resizes the window to fill the screen.
- meta-sends-escape()
- This action toggles the state of the metaSendsEscape resource.
- pointer-button()
- Use this action as a fall-back to handle button press- and release-events
      for the mouse control sequence protocol when the selection-related
      translations are suppressed with the omitTranslation resource.
- pointer-motion()
- Use this action as a fall-back to handle motion-events for the mouse
      control sequence protocol when the selection-related translations are
      suppressed with the omitTranslation resource.
- popup-menu(menuname)
- This action displays the specified popup menu. Valid names (case is
      significant) include: mainMenu, vtMenu, fontMenu, and
      tekMenu.
- print(printer-flags)
- This action prints the window. It is also invoked by the print
      entry in mainMenu.
  
  - The action accepts optional parameters, which temporarily override
      resource settings. The parameter values are matched ignoring case:
  - noFormFeed
- no form feed will be sent at the end of the last line printed (i.e.,
      printerFormFeed is “false”).
- FormFeed
- a form feed will be sent at the end of the last line printed (i.e.,
      printerFormFeed is “true”).
- noNewLine
- no newline will be sent at the end of the last line printed, and wrapped
      lines will be combined into long lines (i.e., printerNewLine is
      “false”).
- NewLine
- a newline will be sent at the end of the last line printed, and each line
      will be limited (by adding a newline) to the screen width (i.e.,
      printerNewLine is “true”).
- noAttrs
- the page is printed without attributes (i.e., printAttributes is
      “0”).
- monoAttrs
- the page is printed with monochrome (vt220) attributes (i.e.,
      printAttributes is “1”).
- colorAttrs
- the page is printed with ANSI color attributes (i.e.,
      printAttributes is “2”).
 
  - print-everything(printer-flags)
- This action sends the entire text history, in addition to the text
      currently visible, to the program given in the printerCommand
      resource. It allows the same optional parameters as the print
      action. With a suitable printer command, the action can be used to load
      the text history in an editor.
- print-immediate()
- Sends the text of the current window directly to a file, as specified by
      the printFileImmediate, printModeImmediate and
      printOptsImmediate resources.
- print-on-error()
- Toggles a flag telling xterm that if it exits with an X error, to
      send the text of the current window directly to a file, as specified by
      the printFileOnXError, printModeOnXError and
      printOptsOnXError resources.
- print-redir()
- This action toggles the printerControlMode between 0 and 2. The
      corresponding popup menu entry is useful for switching the printer off if
      you happen to change your mind after deciding to print random binary files
      on the terminal.
- quit()
- 
    
 This action sends a SIGHUP to the subprogram and exits. It is also invoked
      by the quit entry in mainMenu.
- readline-button()
- Supports the optional readline feature by echoing repeated cursor forward
      or backward control sequences on button release event, to request that the
      host application update its notion of the cursor's position to match the
      button event.
- redraw()
- This action redraws the window. It is also invoked by the redraw
      entry in mainMenu.
- restore()
- Restores the window to the size before it was last maximized.
- scroll-back(count [,units [,mouse] ])
- This action scrolls the text window backward so that text that had
      previously scrolled off the top of the screen is now visible.
  
  - The count argument indicates the number of units (which may
      be page, halfpage, pixel, or line) by which to
      scroll. If no count parameter is given, xterm uses the
      number of lines given by the scrollLines resource.
- An adjustment can be specified for the page or halfpage
      units by appending a “+” or “-” sign followed
      by a number, e.g., page-2 to specify 2 lines less than a page.
- If the second parameter is omitted “lines” is used.
- If the third parameter mouse is given, the action is ignored when
      mouse reporting is enabled.
  - scroll-forw(count [,units [,mouse] ])
- This action is similar to scroll-back except that it scrolls in the
      other direction.
- scroll-lock(on/off/toggle)
- This action sets, unsets or toggles internal state which tells
      xterm whether Scroll Lock is active, subject to the
      allowScrollLock resource.
- scroll-to(count)
- Scroll to the given line relative to the beginning of the saved-lines. For
      instance, “scroll-to(0)” would scroll to the
      beginning. Two special nonnumeric parameters are recognized:
  - scroll-to(begin)
- Scroll to the beginning of the saved lines.
- scroll-to(end)
- Scroll to the end of the saved lines, i.e., to the currently active
    page.
 
  - secure()
- This action toggles the Secure Keyboard mode (see SECURITY),
      and is invoked from the securekbd entry in mainMenu.
- select-cursor-end(destname [, ...])
- This action is similar to select-end except that it should be used
      with select-cursor-start.
- select-cursor-extend()
- This action is similar to select-extend except that it should be
      used with select-cursor-start.
- select-cursor-start()
- This action is similar to select-start except that it begins the
      selection at the current text cursor position.
- select-end(destname [, ...])
- This action puts the currently selected text into all of the selections or
      cutbuffers specified by destname. It also sends a mouse position
      and updates the internal selection state to reflect the end of the
      selection process.
- select-extend()
- This action tracks the pointer and extends the selection. It should only
      be bound to Motion events.
- select-set()
- This action stores text that corresponds to the current selection, without
      affecting the selection mode.
- select-start()
- This action begins text selection at the current pointer location. See the
      section on POINTER USAGE for information on making selections.
- send-signal(signame)
- This action sends the signal named by signame to the xterm
      subprocess (the shell or program specified with the -e command line
      option). It is also invoked by the suspend, continue,
      interrupt, hangup, terminate, and kill entries
      in mainMenu. Allowable signal names are (case is not significant):
      tstp (if supported by the operating system), suspend (same
      as tstp), cont (if supported by the operating system),
      int, hup, term, quit, alrm,
      alarm (same as alrm) and kill.
- set-8-bit-control(on/off/toggle)
- This action sets, unsets or toggles the eightBitControl resource.
      It is also invoked from the 8-bit-control entry in
    vtMenu.
- set-allow132(on/off/toggle)
- This action sets, unsets or toggles the c132 resource. It is also
      invoked from the allow132 entry in vtMenu.
- set-altscreen(on/off/toggle)
- This action sets, unsets or toggles between the alternate and current
      screens.
- set-appcursor(on/off/toggle)
- This action sets, unsets or toggles the handling Application Cursor Key
      mode and is also invoked by the appcursor entry in
    vtMenu.
- set-appkeypad(on/off/toggle)
- This action sets, unsets or toggles the handling of Application Keypad
      mode and is also invoked by the appkeypad entry in
    vtMenu.
- set-autolinefeed(on/off/toggle)
- This action sets, unsets or toggles automatic insertion of line feeds. It
      is also invoked by the autolinefeed entry in vtMenu.
- set-autowrap(on/off/toggle)
- This action sets, unsets or toggles automatic wrapping of long lines. It
      is also invoked by the autowrap entry in vtMenu.
- set-backarrow(on/off/toggle)
- This action sets, unsets or toggles the backarrowKey resource. It
      is also invoked from the backarrow key entry in vtMenu.
- set-bellIsUrgent(on/off/toggle)
- This action sets, unsets or toggles the bellIsUrgent resource. It
      is also invoked by the bellIsUrgent entry in vtMenu.
- set-cursesemul(on/off/toggle)
- This action sets, unsets or toggles the curses resource. It is also
      invoked from the cursesemul entry in vtMenu.
- set-cursorblink(on/off/toggle)
- This action sets, unsets or toggles the cursorBlink resource. It is
      also invoked from the cursorblink entry in vtMenu.
- set-font-doublesize(on/off/toggle)
- This action sets, unsets or toggles the fontDoublesize resource. It
      is also invoked by the font-doublesize entry in
    fontMenu.
- set-font-linedrawing(on/off/toggle)
- This action sets, unsets or toggles the xterm's state regarding
      whether the current font has line-drawing characters and whether it should
      draw them directly. It is also invoked by the font-linedrawing
      entry in fontMenu.
- set-font-packed(on/off/toggle)
- This action sets, unsets or toggles the forcePackedFont resource
      which controls use of the font's minimum or maximum glyph width. It is
      also invoked by the font-packed entry in fontMenu.
- set-hp-function-keys(on/off/toggle)
- This action sets, unsets or toggles the hpFunctionKeys resource. It
      is also invoked by the hpFunctionKeys entry in
    mainMenu.
- set-jumpscroll(on/off/toggle)
- This action sets, unsets or toggles the jumpscroll resource. It is
      also invoked by the jumpscroll entry in vtMenu.
- set-keep-clipboard(on/off/toggle)
- This action sets, unsets or toggles the keepClipboard
    resource.
- set-keep-selection(on/off/toggle)
- This action sets, unsets or toggles the keepSelection resource. It
      is also invoked by the keepSelection entry in vtMenu.
- set-logging(on/off/toggle)
- This action sets, unsets or toggles the state of the logging option.
- set-marginbell(on/off/toggle)
- This action sets, unsets or toggles the marginBell resource.
- set-num-lock(on/off/toggle)
- This action toggles the state of the numLock resource.
- set-old-function-keys(on/off/toggle)
- This action sets, unsets or toggles the state of legacy function keys. It
      is also invoked by the oldFunctionKeys entry in
    mainMenu.
- set-pop-on-bell(on/off/toggle)
- This action sets, unsets or toggles the popOnBell resource. It is
      also invoked by the poponbell entry in vtMenu.
- set-private-colors(on/off/toggle)
- This action sets, unsets or toggles the privateColorRegisters
      resource.
- set-render-font(on/off/toggle)
- This action sets, unsets or toggles the renderFont resource. It is
      also invoked by the render-font entry in fontMenu.
- set-reverse-video(on/off/toggle)
- This action sets, unsets or toggles the reverseVideo resource. It
      is also invoked by the reversevideo entry in vtMenu.
- set-reversewrap(on/off/toggle)
- This action sets, unsets or toggles the reverseWrap resource. It is
      also invoked by the reversewrap entry in vtMenu.
- set-sco-function-keys(on/off/toggle)
- This action sets, unsets or toggles the scoFunctionKeys resource.
      It is also invoked by the scoFunctionKeys entry in
    mainMenu.
- set-scroll-on-key(on/off/toggle)
- This action sets, unsets or toggles the scrollKey resource. It is
      also invoked from the scrollkey entry in vtMenu.
- set-scroll-on-tty-output(on/off/toggle)
- This action sets, unsets or toggles the scrollTtyOutput resource.
      It is also invoked from the scrollttyoutput entry in
    vtMenu.
- set-scrollbar(on/off/toggle)
- This action sets, unsets or toggles the scrollbar resource. It is
      also invoked by the scrollbar entry in vtMenu.
- set-select(on/off/toggle)
- This action sets, unsets or toggles the selectToClipboard resource.
      It is also invoked by the selectToClipboard entry in
    vtMenu.
- set-sixel-scrolling(on/off/toggle)
- This action toggles between inline (sixel scrolling) and absolute
      positioning. It can also be controlled via DEC private mode 80 (DECSDM) or
      from the sixelScrolling entry in the btMenu.
- set-sun-function-keys(on/off/toggle)
- This action sets, unsets or toggles the sunFunctionKeys resource.
      It is also invoked by the sunFunctionKeys entry in
    mainMenu.
- set-sun-keyboard(on/off/toggle)
- This action sets, unsets or toggles the sunKeyboard resource. It is
      also invoked by the sunKeyboard entry in mainMenu.
- set-tek-text(large/2/3/small)
- This action sets the font used in the Tektronix window to the value of the
      selected resource according to the argument. The argument can be either a
      keyword or single-letter alias, as shown in parentheses:
  - large (l)
- Use resource fontLarge, same as menu entry
    tektextlarge.
- two (2)
- Use resource font2, same as menu entry tektext2.
- three (3)
- Use resource font3, same as menu entry tektext3.
- small (s)
- Use resource fontSmall, same as menu entry
    tektextsmall.
 
  - set-terminal-type(type)
- This action directs output to either the vt or tek windows,
      according to the type string. It is also invoked by the
      tekmode entry in vtMenu and the vtmode entry in
      tekMenu.
- set-titeInhibit(on/off/toggle)
- This action sets, unsets or toggles the titeInhibit resource, which
      controls switching between the alternate and current screens.
- set-toolbar(on/off/toggle)
- This action sets, unsets or toggles the toolbar feature. It is also
      invoked by the toolbar entry in mainMenu.
- set-utf8-fonts(on/off/toggle)
- This action sets, unsets or toggles the utf8Fonts resource. It is
      also invoked by the utf8-fonts entry in fontMenu.
- set-utf8-mode(on/off/toggle)
- This action sets, unsets or toggles the utf8 resource. It is also
      invoked by the utf8-mode entry in fontMenu.
- set-utf8-title(on/off/toggle)
- This action sets, unsets or toggles the utf8Title resource. It is
      also invoked by the utf8-title entry in fontMenu.
- set-visibility(vt/tek,on/off/toggle)
- This action sets, unsets or toggles whether or not the vt or
      tek windows are visible. It is also invoked from the tekshow
      and vthide entries in vtMenu and the vtshow and
      tekhide entries in tekMenu.
- set-visual-bell(on/off/toggle)
- This action sets, unsets or toggles the visualBell resource. It is
      also invoked by the visualbell entry in vtMenu.
- set-vt-font(d/1/2/3/4/5/6/7/e/s [,normalfont [,
    boldfont]])
- This action sets the font or fonts currently being used in the
      VTxxx window. The first argument is a single character that
      specifies the font to be used:
d or D indicate the default font (the font
    initially used when xterm was started),
1 through 7 indicate the fonts specified by the
    font1 through font7 resources,
e or E indicate the normal and bold fonts that
    have been set through escape codes (or specified as the second and third
    action arguments, respectively), and
s or S indicate the font selection (as made by
    programs such as xfontsel(1)) indicated by the second action
    argument.
 
  
  - If xterm is configured to support wide characters, an additional
      two optional parameters are recognized for the e argument: wide
      font and wide bold font.
  - smaller-vt-font()
- Set the font to the next smaller one, based on the font dimensions. See
      also set-vt-font().
- soft-reset()
- This action resets the scrolling region. It is also invoked from the
      softreset entry in vtMenu. The effect is identical to a soft
      reset (DECSTR) control sequence.
- spawn-new-terminal(params)
- Spawn a new xterm process. This is available on systems which have
      a modern version of the process filesystem, e.g., “/proc”,
      which xterm can read.
  
  - Use the “cwd” process entry, e.g., /proc/12345/cwd to obtain
      the working directory of the process which is running in the current
      xterm.
- On systems which have the “exe” process entry, e.g.,
      /proc/12345/exe, use this to obtain the actual executable. Otherwise, use
      the $PATH variable to find xterm.
- If parameters are given in the action, pass them to the new xterm
      process.
  - start-cursor-extend()
- This action is similar to select-extend except that the selection
      is extended to the current text cursor position.
- start-extend()
- This action is similar to select-start except that the selection is
      extended to the current pointer location.
- string(string)
- This action inserts the specified text string as if it had been typed.
      Quotation is necessary if the string contains whitespace or
      non-alphanumeric characters. If the string argument begins with the
      characters “0x”, it is interpreted as a hex character
      constant.
- tek-copy()
- This action copies the escape codes used to generate the current window
      contents to a file in the current directory beginning with the name COPY.
      It is also invoked from the tekcopy entry in tekMenu.
- tek-page()
- This action clears the Tektronix window. It is also invoked by the
      tekpage entry in tekMenu.
- tek-reset()
- This action resets the Tektronix window. It is also invoked by the
      tekreset entry in tekMenu.
- vi-button()
- Handles a button event (other than press and release) by echoing a control
      sequence computed from the event's line number in the screen relative to
      the current line:
    
      
 
 
ESC ^P
    
 
  
  - or
    
      
 
 
ESC ^N
    
 
- according to whether the event is before, or after the current line,
      respectively. The ^N (or ^P) is repeated once for each line that the event
      differs from the current line. The control sequence is omitted altogether
      if the button event is on the current line.
  - visual-bell()
- This action flashes the window quickly.
The Tektronix window also has the following action:
  - gin-press(l/L/m/M/r/R)
- This action sends the indicated graphics input code.
The default bindings in the VTxxx window use the SELECT token,
  which is set by the selectToClipboard resource. These are for the
  vt100 widget:
  
          Shift <KeyPress> Prior:scroll-back(1,halfpage) \n\
           Shift <KeyPress> Next:scroll-forw(1,halfpage) \n\
         Shift <KeyPress> Select:select-cursor-start() \
                                 select-cursor-end(SELECT, CUT_BUFFER0) \n\
         Shift <KeyPress> Insert:insert-selection(SELECT, CUT_BUFFER0) \n\
                 Alt <Key>Return:fullscreen() \n\
        <KeyRelease> Scroll_Lock:scroll-lock() \n\
    Shift~Ctrl <KeyPress> KP_Add:larger-vt-font() \n\
    Shift Ctrl <KeyPress> KP_Add:smaller-vt-font() \n\
    Shift <KeyPress> KP_Subtract:smaller-vt-font() \n\
                ~Meta <KeyPress>:insert-seven-bit() \n\
                 Meta <KeyPress>:insert-eight-bit() \n\
                !Ctrl <Btn1Down>:popup-menu(mainMenu) \n\
           !Lock Ctrl <Btn1Down>:popup-menu(mainMenu) \n\
 !Lock Ctrl @Num_Lock <Btn1Down>:popup-menu(mainMenu) \n\
     ! @Num_Lock Ctrl <Btn1Down>:popup-menu(mainMenu) \n\
                ~Meta <Btn1Down>:select-start() \n\
              ~Meta <Btn1Motion>:select-extend() \n\
                !Ctrl <Btn2Down>:popup-menu(vtMenu) \n\
           !Lock Ctrl <Btn2Down>:popup-menu(vtMenu) \n\
 !Lock Ctrl @Num_Lock <Btn2Down>:popup-menu(vtMenu) \n\
     ! @Num_Lock Ctrl <Btn2Down>:popup-menu(vtMenu) \n\
          ~Ctrl ~Meta <Btn2Down>:ignore() \n\
                 Meta <Btn2Down>:clear-saved-lines() \n\
            ~Ctrl ~Meta <Btn2Up>:insert-selection(SELECT, CUT_BUFFER0) \n\
                !Ctrl <Btn3Down>:popup-menu(fontMenu) \n\
           !Lock Ctrl <Btn3Down>:popup-menu(fontMenu) \n\
 !Lock Ctrl @Num_Lock <Btn3Down>:popup-menu(fontMenu) \n\
     ! @Num_Lock Ctrl <Btn3Down>:popup-menu(fontMenu) \n\
          ~Ctrl ~Meta <Btn3Down>:start-extend() \n\
              ~Meta <Btn3Motion>:select-extend() \n\
                 Ctrl <Btn4Down>:scroll-back(1,halfpage,m) \n\
            Lock Ctrl <Btn4Down>:scroll-back(1,halfpage,m) \n\
  Lock @Num_Lock Ctrl <Btn4Down>:scroll-back(1,halfpage,m) \n\
       @Num_Lock Ctrl <Btn4Down>:scroll-back(1,halfpage,m) \n\
                      <Btn4Down>:scroll-back(5,line,m)     \n\
                 Ctrl <Btn5Down>:scroll-forw(1,halfpage,m) \n\
            Lock Ctrl <Btn5Down>:scroll-forw(1,halfpage,m) \n\
  Lock @Num_Lock Ctrl <Btn5Down>:scroll-forw(1,halfpage,m) \n\
       @Num_Lock Ctrl <Btn5Down>:scroll-forw(1,halfpage,m) \n\
                      <Btn5Down>:scroll-forw(5,line,m)     \n\
                         <BtnUp>:select-end(SELECT, CUT_BUFFER0) \n\
                     <BtnMotion>:pointer-motion() \n\
                       <BtnDown>:pointer-button() \n\
                         <BtnUp>:pointer-button() \n\
                       <BtnDown>:ignore()
The default bindings in the Tektronix window are analogous but
    less extensive. These are for the tek4014 widget:
  
                 ~Meta<KeyPress>: insert-seven-bit() \n\
                  Meta<KeyPress>: insert-eight-bit() \n\
                !Ctrl <Btn1Down>: popup-menu(mainMenu) \n\
           !Lock Ctrl <Btn1Down>: popup-menu(mainMenu) \n\
 !Lock Ctrl @Num_Lock <Btn1Down>: popup-menu(mainMenu) \n\
      !Ctrl @Num_Lock <Btn1Down>: popup-menu(mainMenu) \n\
                !Ctrl <Btn2Down>: popup-menu(tekMenu) \n\
           !Lock Ctrl <Btn2Down>: popup-menu(tekMenu) \n\
 !Lock Ctrl @Num_Lock <Btn2Down>: popup-menu(tekMenu) \n\
      !Ctrl @Num_Lock <Btn2Down>: popup-menu(tekMenu) \n\
           Shift ~Meta<Btn1Down>: gin-press(L) \n\
                 ~Meta<Btn1Down>: gin-press(l) \n\
           Shift ~Meta<Btn2Down>: gin-press(M) \n\
                 ~Meta<Btn2Down>: gin-press(m) \n\
           Shift ~Meta<Btn3Down>: gin-press(R) \n\
                 ~Meta<Btn3Down>: gin-press(r)
You can modify the translations resource by overriding parts of it, or
  merging your resources with it.
Here is an example which uses shifted select/paste to copy to the
    clipboard, and unshifted select/paste for the primary selection. In each
    case, a (different) cut buffer is also a target or source of the
    select/paste operation. It is important to remember however, that cut
    buffers store data in ISO-8859-1 encoding, while selections can store data
    in a variety of formats and encodings. While xterm owns the
    selection, it highlights it. When it loses the selection, it removes the
    corresponding highlight. But you can still paste from the corresponding cut
    buffer.
  
*VT100*translations:    #override \n\
   ~Shift~Ctrl<Btn2Up>: insert-selection(PRIMARY, CUT_BUFFER0) \n\
    Shift~Ctrl<Btn2Up>: insert-selection(CLIPBOARD, CUT_BUFFER1) \n\
   ~Shift     <BtnUp> : select-end(PRIMARY, CUT_BUFFER0) \n\
    Shift     <BtnUp> : select-end(CLIPBOARD, CUT_BUFFER1)
In the example, the class name VT100 is used rather than
    the widget name. These are different; a class name could apply to more than
    one widget. A leading “*” is used because the widget hierarchy
    above the vt100 widget depends on whether the toolbar support is
    compiled into xterm.
Most of the predefined translations are related to the mouse, with
    a few that use some of the special keys on the keyboard. Applications use
    special keys (function-keys, cursor-keys, keypad-keys) with modifiers
    (shift, control, alt). If xterm defines a translation for a given
    combination of special key and modifier, that makes it unavailable for use
    by applications within the terminal. For instance, one might extend the use
    of Page Up and Page Down keys seen here:
  
    Shift <KeyPress> Prior : scroll-back(1,halfpage) \n\
    Shift <KeyPress> Next  : scroll-forw(1,halfpage) \n\
to the Home and End keys:
  
    Shift <KeyPress> Home : scroll-to(begin) \n\
    Shift <KeyPress> End  : scroll-to(end)
but then shift-Home and shift-End would then be
    unavailable to applications.
Not everyone finds the three-button mouse bindings easy to use. In
    a wheel mouse, the middle button might be the wheel. As an alternative, you
    could add a binding using shifted keys:
  
*VT100*translations:      #override \n\
    Shift <Key>Home:    copy-selection(SELECT) \n\
    Shift <Key>Insert:  copy-selection(SELECT) \n\
    Ctrl Shift <Key>C:  copy-selection(SELECT) \n\
    Ctrl Shift <Key>V:  insert-selection(SELECT)
You would still use the left- and right-mouse buttons (typically 1
    and 3) for beginning and extending selections.
Besides mouse problems, there are also keyboards with inconvenient
    layouts. Some lack a numeric keypad, making it hard to use the shifted
    keypad plus and minus bindings for switching between font sizes. You can
    work around that by assigning the actions to more readily accessed keys:
  
*VT100*translations:      #override \n\
    Ctrl <Key> +:       larger-vt-font() \n\
    Ctrl <Key> -:       smaller-vt-font()
The keymap feature allows you to switch between sets of
    translations. The sample below shows how the keymap() action may be
    used to add special keys for entering commonly-typed words:
  
*VT100.Translations: #override <Key>F13: keymap(dbx)
*VT100.dbxKeymap.translations: \
        <Key>F14:       keymap(None) \n\
        <Key>F17:       string("next") \n\
                        string(0x0d) \n\
        <Key>F18:       string("step") \n\
                        string(0x0d) \n\
        <Key>F19:       string("continue") \n\
                        string(0x0d) \n\
        <Key>F20:       string("print ") \n\
                        insert-selection(PRIMARY, CUT_BUFFER0)
Key bindings are normally associated with the vt100 or tek4014
  widgets which act as terminal emulators. Xterm's scrollbar (and toolbar
  if it is configured) are separate widgets. Because all of these use the X
  Toolkit, they have corresponding translations resources. Those
  resources are distinct, and match different patterns, e.g., the differences in
  widget-name and number of levels of widgets which they may contain.
The scrollbar widget is a child of the vt100 widget.
    It is positioned on top of the vt100 widget. Toggling the scrollbar
    on and off causes the vt100 widget to resize.
The default bindings for the scrollbar widget use only
    mouse-button events:
  
   <Btn5Down>: StartScroll(Forward) \n\
   <Btn1Down>: StartScroll(Forward) \n\
   <Btn2Down>: StartScroll(Continuous) MoveThumb() NotifyThumb() \n\
   <Btn3Down>: StartScroll(Backward) \n\
   <Btn4Down>: StartScroll(Backward) \n\
   <Btn2Motion>: MoveThumb() NotifyThumb() \n\
   <BtnUp>:    NotifyScroll(Proportional) EndScroll()
Events which the scrollbar widget does not recognize at all
    are lost.
However, at startup, xterm augments these translations with
    the default translations used for the vt100 widget, together with the
    resource “actions” which those translations use. Because the
    scrollbar (or menubar) widgets do not recognize these actions
    (but because it has a corresponding translation), they are passed on to the
    vt100 widget.
This augmenting of the scrollbar's translations has a few
    limitations:
  - Xterm knows what the default translations are, but there is no
      suitable library interface for determining what customizations a user may
      have added to the vt100 widget. All that xterm can do is
      augment the scrollbar widget to give it the same starting point for
      further customization by the user.
- Events in the gap between the widgets may be lost.
- Compose sequences begun in one widget cannot be completed in the other,
      because the input methods for each widget do not share context
      information.
Most customizations of the scrollbar translations do not concern
    key bindings. Rather, users are generally more interested in changing the
    bindings of the mouse buttons. For example, some people prefer using the
    left pointer button for dragging the scrollbar thumb. That can be set up by
    altering the translations resource, e.g.,
  
*VT100.scrollbar.translations:  #override \n\
   <Btn5Down>:     StartScroll(Forward) \n\
   <Btn1Down>:     StartScroll(Continuous) MoveThumb() NotifyThumb() \n\
   <Btn4Down>:     StartScroll(Backward) \n\
   <Btn1Motion>:   MoveThumb() NotifyThumb() \n\
   <BtnUp>:        NotifyScroll(Proportional) EndScroll()
Applications can send sequences of characters to the terminal to change its
  behavior. Often they are referred to as “ANSI escape sequences”
  or just plain “escape sequences” but both terms are misleading:
  - ANSI x3.64 (obsolete) which was replaced by ISO 6429 (ECMA-48) gave rules
      for the format of these sequences of characters.
- While the original VT100 was claimed to be ANSI-compatible (against
      x3.64), there is no freely available version of the ANSI standard to show
      where the VT100 differs. Most of the documents which mention the ANSI
      standard have additions not found in the original (such as those based on
      ansi.sys). So this discussion focuses on the ISO standards.
- The standard describes only sequences sent from the host to the terminal.
      There is no standard for sequences sent by special keys from the terminal
      to the host. By convention (and referring to existing terminals), the
      format of those sequences usually conforms to the host-to-terminal
      standard.
- Some of xterm's sequences do not fit into the standard scheme.
      Technically those are “unspecified”. As an example, DEC
      Screen Alignment Test (DECALN) is this three-character sequence:
    
      
 
 
ESC # 8
    
 
- Some sequences fit into the standard format, but are not listed in the
      standard. These include the sequences used for setting up scrolling
      margins and doing forward/reverse scrolling.
- Some of the sequences (in particular, the single-character functions such
      as tab and backspace) do not include the escape character.
With all of that in mind, the standard refers to these sequences
    of characters as “control sequences”.
Xterm Control Sequences lists the control sequences which
    an application can send xterm to make it perform various operations.
    Most of these operations are standardized, from either the DEC or Tektronix
    terminals, or from more widely used standards such as ISO-6429.
A few examples of usage are given in this section.
Some scripts use echo with options -e and -n to tell the
  shell to interpret the string “\e” as the escape
  character and to suppress a trailing newline on output. Those are not
  portable, nor recommended. Instead, use printf (POSIX).
For example, to set the window title to “Hello
    world!”, you could use one of these commands in a script:
  
printf '\033]2;Hello world!\033\\'
printf '\033]2;Hello world!\007'
printf '\033]2;%s\033\\' "Hello world!"
printf '\033]2;%s\007' "Hello world!"
The printf command interprets the octal value
    “\033” for escape, and (since it was not given in the
    format) omits a trailing newline from the output.
Some programs (such as screen(1)) set both window- and
    icon-titles at the same time, using a slightly different control
  sequence:
  
printf '\033]0;Hello world!\033\\'
printf '\033]0;Hello world!\007'
printf '\033]0;%s\033\\' "Hello world!"
printf '\033]0;%s\007' "Hello world!"
The difference is the parameter “0” in each
    command. Most window managers will honor either window title or icon title.
    Some will make a distinction and allow you to set just the icon title. You
    can tell xterm to ask for this with a different parameter in the
    control sequence:
  
printf '\033]1;Hello world!\033\\'
printf '\033]1;Hello world!\007'
printf '\033]1;%s\033\\' "Hello world!"
printf '\033]1;%s\007' "Hello world!"
Xterm, like any VT100-compatible terminal emulator, has two modes for the
  special keys (cursor-keys, numeric keypad, and certain function-keys):
  - normal mode, which makes the special keys transmit
      “useful” sequences such as the control sequence for
      cursor-up when pressing the up-arrow, and
- application mode, which uses a different control sequence that
      cannot be mistaken for the “useful” sequences.
The main difference between the two modes is that normal mode
    sequences start with CSI (escape [) and application
    mode sequences start with SS3 (escape O).
The terminal is initialized into one of these two modes (usually
    the normal mode), based on the terminal description (termcap or terminfo).
    The terminal description also has capabilities (strings) defined for the
    keypad mode used in curses applications.
There is a problem in using the terminal description for
    applications that are not intended to be full-screen curses applications:
    the definitions of special keys are only correct for this keypad mode. For
    example, some shells (unlike ksh(1), which appears to be hard-coded,
    not even using termcap) allow their users to customize key-bindings,
    assigning shell actions to special keys.
A few shell programs provide the ability for users to add color and other video
  attributes to the shell prompt strings. Users can do this by setting
  $PS1 (the primary prompt string). Again, bash and zsh
  have provided features not found in ksh. There is a problem, however:
  the prompt's width on the screen will not necessarily be the same as the
  number of characters. Because there is no guidance in the POSIX standard, each
  shell addresses the problem in a different way:
  - bash treats characters within “\[” and
      “\]” as nonprinting (using no width on the screen).
- zsh treats characters within “%{” and
      “%}” as nonprinting.
In addition to the difference in syntax, the shells provide
    different methods for obtaining useful escape sequences:
  - •
- As noted in Special Keys, zsh initializes the $terminfo
      array with the terminal capabilities.
  
  - It also provides a function echoti which works like tput(1)
      to convert a terminal capability with its parameters into a string that
      can be written to the terminal.
  - •
- Shells lacking a comparable feature (such as bash) can always use
      the program tput to do this transformation.
Hard-coded escape sequences are supported by each shell, but are
    not recommended because those rely upon particular configurations and cannot
    be easily moved between different user environments.
Xterm sets several environment variables.
Some variables are used on every system:
  - DISPLAY
- is the display name, pointing to the X server (see DISPLAY NAMES in
      X(7)).
- TERM
- 
    
 is set according to the terminfo (or termcap) entry which it is using as a
      reference.
  
  - On some systems, you may encounter situations where the shell which you
      use and xterm are built using libraries with different terminal
      databases. In that situation, xterm may choose a terminal
      description not known to the shell.
  - WINDOWID
- is set to the X window id number of the xterm window.
- XTERM_FILTER
- is set if a locale-filter is used. The value is the pathname of the
      filter.
- XTERM_LOCALE
- shows the locale which was used by xterm on startup. Some shell
      initialization scripts may set a different locale.
- XTERM_SHELL
- is set to the pathname of the program which is invoked. Usually that is a
      shell program, e.g., /bin/sh. Since it is not necessarily a shell
      program however, it is distinct from “SHELL”.
- XTERM_VERSION
- is set to the string displayed by the -version option. That is
      normally an identifier for the X Window libraries used to build
      xterm, followed by xterm's patch number in parenthesis. The
      patch number is also part of the response to a Secondary Device Attributes
      (DA) control sequence (see Xterm Control Sequences).
Depending on your system configuration, xterm may also set the following:
  - COLUMNS
- the width of the xterm in characters (cf: “stty
      columns”).
  
  - When this variable is set, curses applications (and most terminal
      programs) will assume that the terminal has this many columns.
- Xterm would do this for systems which have no ability to tell the
      size of the terminal. Those are very rare, none newer than the mid 1990s
      when SVR4 became prevalent.
  - HOME
- 
    
 when xterm is configured (at build-time) to update utmp.
- LINES
- the height of the xterm in characters (cf: “stty
      rows”).
  
  - When this variable is set, curses applications (and most terminal
      programs) will assume that the terminal has this many lines (rows).
- Xterm would do this for systems which have no ability to tell the
      size of the terminal. Those are very rare, none newer than the mid 1990s
      when SVR4 became prevalent.
  - LOGNAME
- when xterm is configured (at build-time) to update utmp.
  
  - Your configuration may have set LOGNAME; xterm does not
      modify that. If it is unset, xterm will use USER if it is
      set. Finally, if neither is set, xterm will use the
      getlogin(3) function.
  - SHELL
- when xterm is configured (at build-time) to update utmp. It is also
      set if you provide a valid shell name as the optional parameter.
  
  - Xterm sets this to an absolute pathname. If you have set the
      variable to a relative pathname, xterm may set it to a different
      shell pathname.
- If you have set this to an pathname which does not correspond to a valid
      shell, xterm may unset it, to avoid confusion.
  - TERMCAP
- the contents of the termcap entry corresponding to $TERM, with
      lines and columns values substituted for the actual size window you have
      created.
  
  - This feature is, like LINES and COLUMNS, used rarely. It
      addresses the same limitation of a few older systems by providing a way
      for termcap-based applications to get the initial screen size.
  - TERMINFO
- may be defined to a nonstandard location using the configure script.
In the output from xprop(1), there are several properties.
  - WM_CLASS
- This shows the instance name and the X resource class,
      passed to X Toolkit during initialization of xterm, e.g.,
    
      
 
 
WM_CLASS(STRING) = "xterm", "UXTerm"
    
 
- WM_CLIENT_LEADER
- This shows the window-id which xterm provides with an environment
      variable (WINDOWID), e.g.,
    
      
 
 
WM_CLIENT_LEADER(WINDOW): window id # 0x800023
    
 
- WM_COMMAND
- This shows the command-line arguments for xterm which are passed to
      X Toolkit during initialization, e.g.,
    
      
 
 
WM_COMMAND(STRING) = { "xterm", "-class", "UXTerm", "-title", "uxterm", "-u8" }
    
 
- WM_ICON_NAME
- This holds the icon title, which different window managers handle in
      various ways. It is set via the iconName resource. Applications can
      change this using control sequences.
- WM_LOCALE_NAME
- This shows the result from the setlocale(3) function for the
      LC_CTYPE category, e.g.,
    
      
 
 
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
    
 
- WM_NAME
- This holds the window title, normally at the top of xterm's window.
      It is set via the title resource. Applications can change this
      using control sequences.
X Toolkit does not manage EWMH properties. Xterm does this directly.
  - _NET_WM_ICON_NAME
- stores the icon name.
- _NET_WM_NAME
- stores the title string.
- _NET_WM_PID
- stores the process identifier for xterm's display.
  - _NET_SUPPORTED
- Xterm checks this property on the supporting window to decide if
      the window manager supports specific maximizing styles. That may include
      other window manager hints; xterm uses the X library calls to
      manage those.
- _NET_SUPPORTING_WM_CHECK
- Xterm checks this to ensure that it will only update the EWMH properties
      for a window manager which claims EWMH compliance.
- _NET_WM_STATE
- This tells xterm whether its window has been maximized by the
      window manager, and if so, what type of maximizing:
  - _NET_WM_STATE_FULLSCREEN
- _NET_WM_STATE_MAXIMIZED_HORZ
- _NET_WM_STATE_MAXIMIZED_VERT
 
The actual pathnames given may differ on your system.
  - /etc/shells
- contains a list of valid shell programs, used by xterm to decide if
      the “SHELL” environment variable should be set for the
      process started by xterm.
  
  - On systems which have the getusershell function, xterm will
      use that function rather than directly reading the file, since the file
      may not be present if the system uses default settings.
  - /etc/utmp
- the system log file, which records user logins.
- /etc/wtmp
- the system log file, which records user logins and logouts.
- /usr/X11R7/lib/X11/app-defaults/XTerm
- the xterm default application resources.
- /usr/X11R7/lib/X11/app-defaults/XTerm-color
- the xterm color application resources. If your display supports
      color, use this
    
      
 
 
*customization: -color
    
 
  
  - in your .Xdefaults file to automatically use this resource file rather
      than /usr/X11R7/lib/X11/app-defaults/XTerm. If you do not do this,
      xterm uses its compiled-in default resource settings for
    colors.
  - /usr/X11R7/include/X11/pixmaps
- the directory in which xterm's pixmap icon files are
    installed.
Most of the fatal error messages from xterm use the following format:
  
xterm: Error XXX, errno YYY: ZZZ
The XXX codes (which are used by xterm as its
    exit-code) are listed below, with a brief explanation.
  - 1
- is used for miscellaneous errors, usually accompanied by a specific
      message,
- 11
- ERROR_FIONBIO
    
 main: ioctl() failed on FIONBIO
- 12
- ERROR_F_GETFL
    
 main: ioctl() failed on F_GETFL
- 13
- ERROR_F_SETFL
    
 main: ioctl() failed on F_SETFL
- 14
- ERROR_OPDEVTTY
    
 spawn: open() failed on /dev/tty
- 15
- ERROR_TIOCGETP
    
 spawn: ioctl() failed on TIOCGETP
- 17
- ERROR_PTSNAME
    
 spawn: ptsname() failed
- 18
- ERROR_OPPTSNAME
    
 spawn: open() failed on ptsname
- 19
- ERROR_PTEM
    
 spawn: ioctl() failed on I_PUSH/"ptem"
- 20
- ERROR_CONSEM
    
 spawn: ioctl() failed on I_PUSH/"consem"
- 21
- ERROR_LDTERM
    
 spawn: ioctl() failed on I_PUSH/"ldterm"
- 22
- ERROR_TTCOMPAT
    
 spawn: ioctl() failed on I_PUSH/"ttcompat"
- 23
- ERROR_TIOCSETP
    
 spawn: ioctl() failed on TIOCSETP
- 24
- ERROR_TIOCSETC
    
 spawn: ioctl() failed on TIOCSETC
- 25
- ERROR_TIOCSETD
    
 spawn: ioctl() failed on TIOCSETD
- 26
- ERROR_TIOCSLTC
    
 spawn: ioctl() failed on TIOCSLTC
- 27
- ERROR_TIOCLSET
    
 spawn: ioctl() failed on TIOCLSET
- 28
- ERROR_INIGROUPS
    
 spawn: initgroups() failed
- 29
- ERROR_FORK
    
 spawn: fork() failed
- 30
- ERROR_EXEC
    
 spawn: exec() failed
- 32
- ERROR_PTYS
    
 get_pty: not enough ptys
- 34
- ERROR_PTY_EXEC
    
 waiting for initial map
- 35
- ERROR_SETUID
    
 spawn: setuid() failed
- 36
- ERROR_INIT
    
 spawn: can't initialize window
- 46
- ERROR_TIOCKSET
    
 spawn: ioctl() failed on TIOCKSET
- 47
- ERROR_TIOCKSETC
    
 spawn: ioctl() failed on TIOCKSETC
- 49
- ERROR_LUMALLOC
    
 luit: command-line malloc failed
- 50
- ERROR_SELECT
    
 in_put: select() failed
- 54
- ERROR_VINIT
    
 VTInit: can't initialize window
- 57
- ERROR_KMMALLOC1
    
 HandleKeymapChange: malloc failed
- 60
- ERROR_TSELECT
    
 Tinput: select() failed
- 64
- ERROR_TINIT
    
 TekInit: can't initialize window
- 71
- ERROR_BMALLOC2
    
 SaltTextAway: malloc() failed
- 80
- ERROR_LOGEXEC
    
 StartLog: exec() failed
- 83
- ERROR_XERROR
    
 xerror: XError event
- 84
- ERROR_XIOERROR
    
 xioerror: X I/O error
- 85
- ERROR_ICEERROR
    
 ICE I/O error
- 90
- ERROR_SCALLOC
    
 Alloc: calloc() failed on base
- 91
- ERROR_SCALLOC2
    
 Alloc: calloc() failed on rows
- 102
- ERROR_SAVE_PTR
    
 ScrnPointers: malloc/realloc() failed
Large pastes do not work on some systems. This is not a bug in xterm; it
  is a bug in the pseudo terminal driver of those systems. Xterm feeds
  large pastes to the pty only as fast as the pty will accept data, but some pty
  drivers do not return enough information to know if the write has succeeded.When connected to an input method, it is possible for xterm
    to hang if the XIM server is suspended or killed.
Many of the options are not resettable after xterm
  starts.
This program still needs to be rewritten. It should be split into
    very modular sections, with the various emulators being completely separate
    widgets that do not know about each other. Ideally, you'd like to be able to
    pick and choose emulator widgets and stick them into a single control
    widget.
There needs to be a dialog box to allow entry of the Tek COPY file
    name.
resize(1), luit(1), uxterm(1), X(7), Xcursor(7), pty(4), tty(4)
Xterm Control Sequences (this is the file ctlseqs.ms).
https://invisible-island.net/xterm/xterm.html
  
  https://invisible-island.net/xterm/manpage/xterm.html
  
  https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
  
  https://invisible-island.net/xterm/xterm.faq.html
  
  https://invisible-island.net/xterm/xterm.log.html
 
X Toolkit Intrinsics – C Language Interface (Xt),
  
  Joel McCormack, Paul Asente, Ralph R. Swick (1994),
  
  Thomas E. Dickey (2019).
Inter-Client Communication Conventions Manual (ICCCM),
  
  David Rosenthal and Stuart W. Marks (version 2.0, 1994).
Extended Window Manager Hints (EWMH),
  
  X Desktop Group (version 1.3, 2005).
EWMH uses UTF8_STRING pervasively without defining it, but
    does mention the ICCCM. Version 2.0 of the ICCCM does not address UTF-8.
    That is an extension added in XFree86.
  - •
- Markus Kuhn summarized this in UTF-8 and Unicode FAQ for Unix/Linux
      (2001), in the section “Is X11 ready for Unicode?”
  
  - https://www.cl.cam.ac.uk/~mgk25/unicode.html
  - •
- Juliusz Chroboczek proposed the UTF8_STRING selection atom in 1999/2000,
      which became part of the ICCCM in XFree86.
  
  - https://www.irif.fr/~jch/software/UTF8_STRING/
- An Xorg developer removed that part of the documentation in 2004 when
      incorporating other work from XFree86 into Xorg. The feature is still
      supported in Xorg, though undocumented as of 2019.
Far too many people.These contributed to the X Consortium: Loretta Guarino Reid
    (DEC-UEG-WSL), Joel McCormack (DEC-UEG-WSL), Terry Weissman (DEC-UEG-WSL),
    Edward Moy (Berkeley), Ralph R. Swick (MIT-Athena), Mark Vandevoorde
    (MIT-Athena), Bob McNamara (DEC-MAD), Jim Gettys (MIT-Athena), Bob Scheifler
    (MIT X Consortium), Doug Mink (SAO), Steve Pitschke (Stellar), Ron Newman
    (MIT-Athena), Jim Fulton (MIT X Consortium), Dave Serisky (HP), Jonathan
    Kamens (MIT-Athena).
Beginning with XFree86, there were far more identifiable
    contributors. The THANKS file in xterm's source lists 234 in
    August 2021. Keep in mind these: Jason Bacon, Jens Schweikhardt, Ross Combs,
    Stephen P. Wall, David Wexelblat, and Thomas Dickey
  (invisible-island.net).