domainname
display or set NIS domain name
TLDR
Show current NIS domain name
SYNOPSIS
domainname [name]
DESCRIPTION
domainname displays or sets the system's NIS (Network Information Service) domain name. This is different from the DNS domain name and is used for NIS/YP services.
Without arguments, it shows the current NIS domain. With an argument, it sets the domain name (requires root privileges). The setting is typically not persistent across reboots without additional configuration.
PARAMETERS
-v, --verbose
Be verbose about actions.-F file
Read domain name from file.--help
Display help.--version
Show version.
CAVEATS
Different from DNS domain name. Setting is not persistent by default. NIS is deprecated in favor of LDAP. Rarely used on modern systems.
HISTORY
domainname dates back to the early days of NIS (originally Yellow Pages, YP), developed at Sun Microsystems in the 1980s. NIS provided centralized authentication and configuration for Unix networks. While largely replaced by LDAP and Kerberos, the command remains for compatibility.
SEE ALSO
hostname(1), dnsdomainname(1), nisdomainname(1), ypbind(1)