ypwhich returns the name of the NIS server that supplies the NIS
services to a NIS client, or which is the master for a map.
If invoked without arguments, it gives the NIS server for
the local machine. If
hostname is specified, that machine is queried to find out which NIS
master it is using.
Specify a domain other than the default domain.
This option inhibits map nickname translation.
Find the master NIS server for a map.
hostname can be specified with the
mname can be a mapname or nickname for a map.
mname is omitted,
ypwhich will produce a list of available maps.