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.
