AD&D 5th Edition - Xanathar's Enemies and Allies
Dungeon Master's Guild Adepts
Rootkits and Bootkits
Alex Matrosov, Eugene Radionov, Sergey Bratus
Practical Malware Analysis
Michael Sikorski and Andrew Honig
Real-World Bug Hunting
Peter Yaworski
Cybersecurity Ops with bash
Paul Troncone & Carl Albing Ph.D.
The Linux Command Line, 2nd Edition
William Shotts
Bash Cookbook
Carl Albing & JP Vossen
Linux System Programming
Robert Love
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & Arnold Robbins
grep Pocket Reference
John Bambenek & Agnieszka Klus
Classic Shell Scripting
Arnold Robbins & Nelson H. F. Beebe
Linux Device Drivers
Jonathan Corbet & Alessandro Rubini & Greg Kroah-Hartman
Effective Awk Programming
Arnold Robbins
Linux Basics for Hackers
OccupyTheWeb
Linux Pocket Guide
Daniel J. Barrett
Unix Power Tools
Shelley Powers