Metasploit: The Penetration Tester's Guide
David Kennedy, Jim O'Gorman, Devon Kearns, Mati Aharoni
Web Security for Developers
Malcolm McDonald
Quick Start Guide
John Schember
Docker: Up & Running
Sean P. Kane & Karl Matthias
grep Pocket Reference
John Bambenek & Agnieszka Klus
Learning the Vi and Vim Editors
Arnold Robbins & Elbert Hannah
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & Arnold Robbins