99 Bottles of OOP (Beer, PHP)
Sandi Metz & Katrina Owen & TJ Stankus
Pitmaster
Andy Husbands & Chris Hart
Effective awk Programming
Arnold Robbins
Refactoring UI
Adam Wathan & Steve Schoger
Wicked Cool Shell Scripts
Dave Taylor & Brandon Perry
The Linux Command Line: A Complete Introduction
William Shotts
Learning the bash Shell, 3rd Edition
Cameron Newham
Classic Shell Scripting
Arnold Robbins & Nelson H. F. Beebe
Bash Command Line and Shell Scripts
Oswald Campesato