Hostname

A Hostname is the name given either to localhost, a computer on a LAN, or a node in the DNS hierarchy.

To find out your hostname, use the following command: $ uname -n or $ hostname

The hostname of a computer can be changed in several different ways. In Red Hat, to permanently change the hostname, modify the HOSTNAME value in: /etc/sysconfig/network

To immediately (but not permanently) change the hostname: $ hostname newhostname

Problems
Changing the hostname can make X WindoWing programs not start any longer: tweedleburg:~ # xclock ^C tweedleburg:~ # hostname bla tweedleburg:~ # xclock No protocol specified Error: Can't open display: :0.0

Provided by
Not all distributions provide this command, but most (all?) of the ones that do incorporate this from the GNU Coreutils: and use its man page

Related Commands
All of these relate to system-wide information.
 * date - set or show the time.
 * arch - show CPU hardware details.
 * nproc - Show the number of cores.
 * uname - Show host and kernel information.
 * hostid - Show the host's numeric ID.
 * uptime - Show system uptime and recent load averages.