ypcat prints out the values of all keys from the NIS database specified by
mapname, which may be a map name or a map nickname.
The options are as follows:
-d domainname
Specify a domain other than the default domain.
-k
Display map keys. 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).