dnsdomainname - show the system's DNS domain name
To display the alias name $ dnsdomainname -a
To display all the fully qualified domain names $ dnsdomainname -A
To set default hostname if none available $ dnsdomainname -b ilugc
To Displays the short hostname $ dnsdomainname -s
To display addresses for the host name $ dnsdomainname -i
To display all addresses for the host $ dnsdomainname -I
To Displays the Network Information System (NIS) domain name $ dnsdomainname -y
regards, T.Dhanasekar