This command removes user group permanently.
delgroup [--help] [--group=groupname] [--newgroup=groupname]
When run without any arguments this program runs in interactive mode prompting for group to be deleted. Groups can also be removed non-interactively by specifying --group option on command-line. Normally users that were in the deleted group are left without a group. If --newgroup is specified then any users that were in the deleted group are assigned to this group.