dnsdomainname — show DNS domain name

       Show the domain part of the system's fully qualified host name.

       The  tool  uses gethostname(2) to get the host name of the system and getaddrinfo(2) to resolve it into a
       canonical name.  The part after the first period (‘.’) of the canonical name is shown.

       dnsdomainname — show DNS domain name

-?, --help
               Give this help list.

       --usage
               Give a short usage message.

       -V, --version
               Print program version.

gethostname(2), getaddrinfo(3)

GNU Network Utilities                           February 1, 2019                                dnsdomainname(1)

dnsdomainname [option...]