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Add Existing User To New Group
$ sudo groupadd <newgroup> $ sudo usermod -a -G <newgroup> <username>
The -G option specifies that you want the user to be added to this <i>secondary</i> group. Odds are, they are in more than one group already and you don't want to bump them out of their <i>primary</i> group. You can then run the following command to see that the user was added succesfully:
$ id <username>
<a href="http://www.cyberciti.biz/faq/howto-linux-add-user-to-group">Reference</a>
