Classic Shell Scripting
Arnold Robbins and Nelson H. F. Beebe
grep Pocket Reference
John Bambenek and Agnieszka Klus
Learning the bash Shell, 3rd Edition
Cameron Newham
Linux Device Drivers, 3rd Edition
Jonathan Corbet & Alessandro Rubini & and Greg Kroah-Hartman
UNIX Power Tools, 3rd Edition
Jerry Peek & Shelley Powers & Tim O’Reilly & and Mike Loukides
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & and Arnold Robbins
Linux System Programming
Robert Love