Hostname

Set the system’s hostname in /etc/myname. My test system is called caddis.blackhelicopters.org.

$ cat /etc/myname
caddis.blackhelicopters.org

To change the hostname, edit /etc/myname. The new hostname takes effect after the next reboot.

To change the hostname until the next boot, use hostname -s and the new hostname, like this:

# hostname -s treble.blackhelicopters.org
# hostname
treble.blackhelicopters.org

You can edit /etc/myname and run hostname -s to make a change take effect immediately and persist after the next boot.