Bash Key ReferenceA concise guide to help you write shell scriptsYou need to know how to work with the Bash shell to handle the deepest parts of Mac OS X, Linux, or other Unix-like systems. This book is based on version 4.4 of the Linux standard shell, Bash shell, and is designed to provide you with instant access to important information about Bash. When writing a shell script, you will usually be asked questions such as which characters to quote, how to correctly perform variable substitution...