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FreeBSD 11.0 - man page for hostname (freebsd section 1)

HOSTNAME(1)						    BSD General Commands Manual 					       HOSTNAME(1)

NAME
hostname -- set or print name of current host system
SYNOPSIS
hostname [-fs] [name-of-host]
DESCRIPTION
The hostname utility prints the name of the current host. The super-user can set the hostname by supplying an argument; this is usually done in the initialization script /etc/rc.d/hostname, normally run at boot time. This script uses the hostname variable in /etc/rc.conf. Options: -f Include domain information in the printed name. This is the default behavior. -s Trim off any domain information from the printed name.
SEE ALSO
gethostname(3), rc.conf(5)
HISTORY
The hostname command appeared in 4.2BSD.
BSD
December 7, 2006 BSD