grotty - groff driver for typewriter-like devices
grotty [ -bBcdfhioruUv ] [ -Fdir ] [ files...
  ]
It is possible to have whitespace between the -F option and
    its parameter.
grotty translates the output of GNU troff into a form suitable for
  typewriter-like devices. Normally grotty should be invoked by using the
  groff command with a -Tascii, -Tlatin1 or -Tutf8
  option on ASCII based systems, and with -Tcp1047 and -Tutf8 on
  EBCDIC based hosts. If no files are given, grotty will read the
  standard input. A filename of - will also cause grotty to read
  the standard input. Output is written to the standard output.
By default, grotty emits SGR escape sequences (from ISO
    6429, also called ANSI color escapes) to change text attributes (bold,
    italic, colors). This makes it possible to have eight different background
    and foreground colors; additionally, bold and italic attributes can be used
    at the same time (by using the BI font).
The following colors are defined in tty.tmac: black, white,
    red, green, blue, yellow, magenta, cyan. Unknown colors are mapped to the
    default color (which is dependent on the settings of the terminal; in most
    cases, this is black for the foreground and white for the background).
Use the -c switch to revert to the old behaviour, printing
    a bold character c with the sequence `c
    BACKSPACE c' and an italic character c by the
    sequence `_ BACKSPACE c'. At the same time,
    color output is disabled. The same effect can be achieved by setting either
    the GROFF_NO_SGR environment variable or using the `sgr' X command
    (see below).
For SGR support, it is necessary to use the -R option of
    less(1) to disable the interpretation of grotty's old output
    format. Consequently, all programs which use less as the pager
    program have to pass this option to it. For man(1) in particular,
    either add -R to the $PAGER environment variable, e.g.
PAGER="/usr/bin/less -R"
  
  export PAGER
 
or use the -P option of man to set the pager
    executable and its options, or modify the configuration file of man
    in a similar fashion.
grotty's old output format can be displayed on a terminal
    by piping through ul(1). Pagers such as more(1) or
    less(1) are also able to display these sequences. Use either
    -B or -U when piping into less(1); use -b when
    piping into more(1). There is no need to filter the output through
    col(1) since grotty never outputs reverse line feeds.
The font description file may contain a command
  
  - internalname n
where n is a decimal integer. If the 01 bit in n is
    set, then the font will be treated as an italic font; if the 02 bit is set,
    then it will be treated as a bold font. The code field in the font
    description field gives the code which will be used to output the character.
    This code can also be used in the \N escape sequence in
  troff.
  - -b
- Suppress the use of overstriking for bold characters. Ignored if -c
      isn't used.
- -B
- Use only overstriking for bold-italic characters. Ignored if -c
      isn't used.
- -c
- Use grotty's old output format (see above). This also disables
      color output.
- -d
- Ignore all \D commands. Without this grotty will render
      \D'l...' commands that have at least one zero argument (and so are
      either horizontal or vertical) using -, |, and +
      characters.
- -f
- Use form feeds in the output. A form feed will be output at the end of
      each page that has no output on its last line.
- -Fdir
- Prepend directory dir/devname to the search path for
      font and device description files; name is the name of the device,
      usually ascii, latin1, utf8, or cp1047.
- -h
- Use horizontal tabs in the output. Tabs are assumed to be set every 8
      columns.
- -i
- Use escape sequences to set the italic text attribute instead of the
      underline attribute for italic fonts (`I' and `BI'). Note that most
      terminals (including xterm) don't support this. Ignored if -c is
      active.
- -o
- Suppress overstriking (other than for bold or underlined characters in
      case the old output format has been activated with -c).
- -r
- Use escape sequences to set the reverse text attribute instead of the
      underline attribute for italic fonts (`I' and `BI'). Ignored if -c
      is active.
- -u
- Suppress the use of underlining for italic characters. Ignored if
      -c isn't used.
- -U
- Use only underlining for bold-italic characters. Ignored if -c
      isn't used.
- -v
- Print the version number.
grotty understands a single X command produced using the \X escape
  sequence.
  - \X'tty: sgr n'
- If n is non-zero or missing, enable SGR output (this is the
      default), otherwise use the old drawing scheme for bold and
    underline.
  - GROFF_NO_SGR
- If set, the old drawing scheme for bold and underline (using the backspace
      character) is active. Colors are disabled.
  - /usr/share/groff_font/devascii/DESC
- Device description file for ascii device.
- /usr/share/groff_font/devascii/F
- Font description file for font F of ascii device.
- /usr/share/groff_font/devlatin1/DESC
- Device description file for latin1 device.
- /usr/share/groff_font/devlatin1/F
- Font description file for font F of latin1 device.
- /usr/share/groff_font/devutf8/DESC
- Device description file for utf8 device.
- /usr/share/groff_font/devutf8/F
- Font description file for font F of utf8 device.
- /usr/share/groff_font/devcp1047/DESC
- Device description file for cp1047 device.
- /usr/share/groff_font/devcp1047/F
- Font description file for font F of cp1047 device.
- /usr/share/tmac/tty.tmac
- Macros for use with grotty.
- /usr/share/tmac/tty-char.tmac
- Additional klugdey character definitions for use with grotty.
Note that on EBCDIC hosts, only files for the cp1047 device
    will be installed.
grotty is intended only for simple documents.
There is no support for fractional horizontal or vertical
  motions.
There is no support for \D commands other than horizontal
    and vertical lines.
Characters above the first line (ie with a vertical position
    of 0) cannot be printed.
Color handling is different compared to grops(1). \M
    doesn't set the fill color for closed graphic objects (which grotty
    doesn't support anyway) but changes the background color of the character
    cell, affecting all subsequent operations.
groff(1), troff(1), groff_out(5), groff_font(5),
  groff_char(7), ul(1), more(1), man(1),
  less(1)