Adding a group in Linux with addgroup
addgroup linux commanhd allow you to create a group.
addgroup [options] [--gid ID] group
Example
root@ok:~# addgroup sokadmin Adding group `sokadmin' (GID 1004) ... Done. root@ok:~#
Add a system group (normally group id below 500, run
addgroup --system [options] [--gid ID] group