From LQWiki

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

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, write it to the proc file with the following command:

   # echo newhostname > /proc/sys/kernel/hostname

See also

• workgroup/domain
• DNS
• hosts file

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