HOSTNAME(1) NetBSD General Commands Manual HOSTNAME(1)
hostname -- set or print name of current host system
hostname [-s] [name-of-host]
hostname prints the name of the current host. The super-user can set the host name by supplying an argument; this is usually done in the network initialization script /etc/rc.d/network, normally run at boot time. Options: -s Trims off any domain information from the printed name.
domainname(1), gethostname(3), sethostname(3)
The hostname utility appeared in 4.2BSD. NetBSD 9.0 April 28, 1995 NetBSD 9.0
You can also request any man page by name and (optionally) by section: