ypmatch —
print the values of one or more keys in a NIS database
  
    | ypmatch | [ -ktz] [-bnum_retry] [-ddomainname] key ...
      mapname | 
ypmatch prints out the values of one or more keys from
  the NIS database specified by mapname, which may be a
  map name or a map nickname.
The options are as follows:
  - -bnum_retry
- Do not wait infinite time for the ypserver to come up. Retry only the
      specified number of times. See
      yp_setbindtries(3)
      for explanation. The valid range is limited from 0 to 65535 by this
      program.
- -ddomainname
- Specify a domain other than the default domain.
- -k
- Print the map key followed by a colon, before printing key value. This
      option is useful with maps in which the values are null or the key is not
      part of the value.
- -t
- Inhibit translation of map nicknames to their corresponding map
    names.
- -x
- Display the map nickname table, found in
      /var/yp/nicknames. A built-in default translation
      table is used if /var/yp/nicknames does not exist
      (see nicknames(5) for
      details).
- -z
- Append a NUL character at the end of the key when doing the lookup. This
      is useful for mail.aliases maps, which include a trailing NUL in the
    keys.