Expanding on this subject --

<http://tldp.org/> is The Linux Documentation Project. Many more
books and guides can be seen and downloaded from here:

<http://tldp.org/guides.html>

and The Linux Gazette with many tips and techniques is here:

Current issue: <http://tldp.org/LDP/LGNET/current/>

Archives (back to 1995): <http://tldp.org/LDP/LGNET/archives.html>

Gazette in other languages: <http://tldp.org/LDP/LGNET/mirrors.html>

and the home site: <http://linuxgazette.net/>