Apache Web Server Administration and E-Commerce Handbook
Scott Hawkins
Linux Desk Reference, Second Edition
Integrating Linux and Windows
Mike McCune
Linux Assembly Language Programming
Bob Neveln
Linux Shells By Example
Ellie Quigley
Perl By Example, Third Edition
Linux: Rute User's Tutorial and Exposition
Paul Sheer
Real World Linux Security: Intrusion Prevention, Detection, and Recovery, Second Edition
Bob Toxen