dnsdomainname (1) - show the system's DNS domain name domainname (1) - show or set the system's NIS/YP domain name getdomainname (2) - get/set domain name nisdomainname (1) - show or set the system's NIS/YP domain name setdomainname (2) - get/set domain name ypdomainname (1) - show or set the system's NIS/YP domain name