/etc/group
group database
Delete a unix group
rmgroup group
rmgroup deletes the specified UNIX group from group database. rmgroup will not delete the system groups wheel, daemon, kmem, sys, tty, operator, bin, nogroup, nobody, or groups with gid 0. Do not delete these groups.
/etc/group
group database
61 releases since OpenBSD 2.1; the text changed 8 times.