Rootkits and Bootkits
Alex Matrosov, Eugene Radionov, Sergey Bratus
Linux Basics for Hackers
OccupyTheWeb
Bash Cookbook
Carl Albing & JP Vossen
Unix Power Tools
Shelley Powers
Black Hat Go
Tom Steele & Chris Patten & Dan Kottmann
The Linux Command Line, 2nd Edition
William Shotts
Web Security for Developers
Malcolm McDonald
The Hardware Hacker
Andrew Bunnie Huang