Learning the bash Shell
Cameron Newham
FIST ULTRA EDITION form fillable character sheet v1.1
Claymore
Practical Malware Analysis
Michael Sikorski and Andrew Honig
Metasploit: The Penetration Tester's Guide
David Kennedy, Jim O'Gorman, Devon Kearns, Mati Aharoni
grep Pocket Reference
John Bambenek & Agnieszka Klus
Docker: Up & Running
Sean P. Kane & Karl Matthias
Learning the Vi and Vim Editors
Arnold Robbins & Elbert Hannah
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & Arnold Robbins