groupmems - administer members of a user's primary group
user : ilugc
group : foss
To make the user ilugc a member of the group foss
$ sudo groupmems -g foss -a ilugc
To add a user to a group
$ sudo groupmems -a ilugc -g foss
To delete/remove a user from a group
$ sudo groupmems -d ilugc foss -g foss
To change the group name
$ sudo groupmems -g linux
To remove the users from group
$ sudo groupmems -p -g ilugc
or
$ sudo groupmems --purge -g ilugc
To list the members of the group
$ sudo groupmems -l -g foss
regards,
T.Dhanasekar