Metasploit: The Penetration Tester's Guide
David Kennedy, Jim O'Gorman, Devon Kearns, Mati Aharoni
Linux System Programming
Robert Love
Penetration Testing: A Hands-On Introduction to Hacking
Gorgia Weidman
FIST Ultra Edition (Retail Version)
Claymore
grep Pocket Reference
John Bambenek & Agnieszka Klus
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & Arnold Robbins
Docker: Up & Running
Sean P. Kane & Karl Matthias
Learning the Vi and Vim Editors
Arnold Robbins & Elbert Hannah