dnsdomainname: Show DNS domain name
dnsdomainname is a program to show the domain part of the
system’s fully qualified domain name. For example, if the FQDN of the
name.example.org the command will show
The output is not necessarily related to the NIS/YP domain name.
The tool uses gethostname to get the host name of the system and
then getaddrinfo to resolve it into a canonical name.
The domain part of the canonical name is shown, i.e., the part
after the first period (
.) of the official name.
There is no command specific option.