Mastering Linux Shell Scripting

Unix Power Scripting: Advanced Awk and KSH Shell Scripts

Unix Shell Programming

Learning the Korn Shell (Nutshell Handbooks)

Linux Shell Scripting Cookbook - Third Edition: Do amazing things with the shell and automate tedious tasks

Linux Command Line and Shell Scripting Bible

Unix in 24 Hours, Sams Teach Yourself: Covers OS X, Linux, and Solaris

Automating Linux and Unix System Administration (Expert's Voice in Linux)

Beginning Portable Shell Scripting: From Novice to Professional (Expert's Voice in Open Source)

Linux Command Line and Shell Scripting Techniques: Master practical aspects of the Linux command line and then use it as a part of the shell scripting process