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Add Existing User To New Group

05.12.2009
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$ 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>