domainname - display or set the name of the current NIS domain for this system
The domainname command, when used without an argument, displays the name of the current domain. When used with argument, sets the current Network Information Service (NIS) domain name to the specified domain name.
A domain is a logical grouping of networked-connected systems established for the purpose of sharing a common set of NIS data files. Domains are only used by NIS.
The NIS maps for a particular domain are stored in the directory
on each NIS
server. Each NIS map contains a set of keys and associated key values. For
example, in a map called
hosts.byname, the host names stored
there constitute the keys. The corresponding internet addresses of each host
constitute the associated key values.