bash Cookbook: Solutions and Examples for bash Users, Edition 2

sed & awk: UNIX Power Tools, Edition 2

Shell Scripting: Expert Recipes for Linux, Bash, and more

Classic Shell Scripting: Hidden Commands that Unlock the Power of Unix

Effective awk Programming: Universal Text Processing and Pattern Matching, Edition 4

sed and awk Pocket Reference: Text Processing with Regular Expressions, Edition 2

Bash Pocket Reference: Help for Power Users and Sys Admins, Edition 2

bash Idioms: Write Powerful, Flexible, Readable Shell Scripts

vi Editor Pocket Reference

The Art of UNIX Programming

Linux in a Nutshell: A Desktop Quick Reference, Edition 6

GDB Pocket Reference: Debugging Quickly & Painlessly with GDB

SSH, The Secure Shell: The Definitive Guide: The Definitive Guide, Edition 2

Essential System Administration: Tools and Techniques for Linux and Unix Administration, Edition 3

Introduction to Programming Languages

Linux Kernel Development: Edition 3

Understanding the Linux Kernel: From I/O Ports to Process Management, Edition 3

Advanced Programming in the UNIX Environment: Edition 3

Linux Basics for Hackers: Getting Started with Networking, Scripting, and Security in Kali

Wicked Cool Shell Scripts, 2nd Edition: 101 Scripts for Linux, OS X, and UNIX Systems