Bash. Pocket Guide for System Administrators

To learn to skillfully interact with Mac OS X, Linux, and other Unix-like operating systems, you need to master the skills of working with the Bash shell. This concise guide will allow you to have the most essential information about Bash at your fingertips.
In it, you will be able to quickly find answers to pressing questions that often arise when writing shell scripts, including the following: which characters should be enclosed in quotes, how to perform variable substitution, and how to properly use arrays? This edition, updated to Bash version 4.4, provides answers to these and many other questions in a convenient and concise form.