Learning the bash Shell: Unix Shell Programming (In a Nutshell (O'Reilly))
sed & awk: UNIX Power Tools (Nutshell Handbooks)
bash Cookbook: Solutions and Examples for bash Users (Cookbooks (O'Reilly))
Bash Pocket Reference: Help for Power Users and Sys Admins
Mastering Regular Expressions: Understand Your Data and Be More Productive
Learning the vi and Vim Editors: Text Processing at Maximum Speed and Power
Wicked Cool Shell Scripts, 2nd Edition: 101 Scripts for Linux, OS X, and UNIX Systems
grep Pocket Reference: A Quick Pocket Reference for a Utility Every Unix User Needs (Pocket Reference (O'Reilly))
Shell Scripting: How to Automate Command Line Tasks Using Bash Scripting and Shell Programming
Linux Command Line and Shell Scripting Bible