HOSTNAME(1) BSD Reference 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
hostname by supplying an argument; this is usually done in the network
initialization script /etc/netstart, normally run at boot time.
-s Trims off any domain information from the printed name.
The hostname command appeared in 4.2BSD.
4.2 Berkeley Distribution April 28, 1995 1