Linux Pocket Guide
Daniel J. Barrett
Quick Start Guide
John Schember
The Linux Command Line, 2nd Edition
William Shotts
Linux Device Drivers
Jonathan Corbet & Alessandro Rubini & Greg Kroah-Hartman
Unix Power Tools
Shelley Powers
Network Programmability and Automation
Jason Edelman & Scott S. Lowe & Matt Oswalt
Linux System Programming
Robert Love
Learning the bash Shell
Cameron Newham
Learning CoreDNS
John Belamaric & Cricket Liu
Effective Awk Programming
Arnold Robbins
Cybersecurity Ops with bash
Paul Troncone & Carl Albing Ph.D.
Classic Shell Scripting
Arnold Robbins & Nelson H. F. Beebe
Bash Cookbook
Carl Albing & JP Vossen