groups and gnome-terminal

[Gordon Messmer]

Fernando Apesteguía wrote:
> 
> But the gnome application to manage users and groups do it well... no
> login is required for it.

The gnome application is looking up the group membership for the user 
you select.  If you use "groups <username>", you should get the same 
information.  If you use "groups", with no argument, it will tell you 
what groups that you were a member of, when you logged in.  That list 
will tell you what resources you currently have access to.  In order to 
gain access to resources controlled to you need to log out.  You might 
also be able to use "newgrp" in a terminal to get access within that 
terminal session.