Linux Basics for Hackers
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Linux_Essentials
The CSS Detective Guide: Tricks for solving tough CSS mysteries
Denise R. Jacobs
Hacking; The Art of Exploration
Jon Erickson
Command Line Kung Fu: Bash Scripting Tricks, Linux Shell Programming ...
Jason Cannon
UNIX and Linux System Administration Handbook, 5E
Evi Nemeth & Garth Snyder & Trent R. Hein & Ben Whaley & Dan Mackin