Yes, we think the Bash Pocket Reference is worth it. Bash Pocket Reference by Arnold Robbins provides quick answers to questions that frequently come up while Bash scripting. This includes characters you need to quote and how to use arrays. In addition to these, you'll also get answers on Bash syntax, functions and variables, arithmetic expressions and more. The Bash Pocket Reference is ideal for those already familiar with Bash but just need a quick guide to aide and guide them along.