I think a lot of people new to GNU/Linux don’t understand the whole “users thing”. This short, practical guide to user management in Ubuntu and GNU/Linux will make it all clear.
A related wiki page : Add Users Howtoforum thread
Recently I received the question via email — “…How do I change user rights under UNIX? I am using Red Hat Enterprise Linux and my background includes Windows network…”
Ubuntu Demon\'s blog 
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