Displays or sets the name of the current Network Information Service (NIS) domain.
/usr/bin/domainname [ DomainName ]
The domainname command displays or sets the name of the current NIS domain. If you do not specify a parameter, the domainname command displays the name of the current NIS domain. A domain typically encompasses a group of hosts under the same administration.
Only the root user can set the name of the domain by giving the domainname command an argument.
domainname caesardomainname