bash Cookbook
Carl Albing & JP Vossen
Classic Shell Scripting
Arnold Robbins & Nelson H. F. Beebe
Effective awk Programming
Arnold Robbins
grep Pocket Reference
John Bambenek & Agnieszka Klus
Introducing Regular Expressions
Michael Fitzgerald
Learning GNU Emacs, 3rd Edition
Debra Cameron, & James Elliott & Marc Loy & Eric S. Raymond & Bill Rosenblatt
Learning the bash Shell, 3rd Edition
Cameron Newham
Learning the vi and Vim Editors
Arnold Robbins & Elbert Hannah & Linda Lamb
Linux Device Drivers, 3rd Edition
Jonathan Corbet & Alessandro Rubini & Greg Kroah-Hartman
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & Arnold Robbins
Linux System Programming
Robert Love
Mastering Regular Expressions, Third Edition
Jeffrey E. F. Friedl
sed & awk, 2nd Edition
Dale Dougherty & Arnold Robbins
UNIX Power Tools, 3rd Edition
Jerry Peek, Shelley Powers, Tim O’Reilly & Mike Loukides