ypdomainname - show or set the system's NIS/YP domain name
To print alias names $ ypdomainname -a
To display all long host names (FQDNs) $ ypdomainname -A
To display ypdomainname $ ypdomainname -yp
To print all addresses for the host $ ypdomainname -I
To print short host name $ ypdomainname -s
To print addresses for the host name $ ypdomainname -i
To print help options $ ypdomainname -h
regards, T.Dhanasekar