grep Pocket Reference
John Bambenek & Agnieszka Klus
The Linux Command Line, 2nd Edition
William Shotts
Foundations of Information Security: A Straightforward Introduction
Jason Andress
Attacking Network Protocols
James Forshaw
Black Hat Go
Tom Steele & Chris Patten & Dan Kottmann
The Hardware Hacker
Andrew Bunnie Huang
Web Security for Developers
Malcolm McDonald