Using the z/OS UNIX dnsdomainname command

Use the z/OS UNIX dnsdomainname command to display the DNS domain name of the system. The dnsdomainname command uses the following for determining this information:

TCPIP.DATA statement information
DNS lookup on the value returned by gethostname()
The gethostname() function call, which is documented in z/OS XL C/C++ Runtime Library Reference

The dnsdomainname command and the hostname command are processed by the same function and support most of the same parameters. See Using the z/OS UNIX hostname command for more detailed information about the methods used to provide the host and domain names. See the description of the hostname command parameters in z/OS UNIX hostname: Identify the local host for a more detailed description of the dnsdomainname command parameters.

You must issue the z/OS UNIX dnsdomainname command from within the z/OS UNIX shell.