All-In-One Programming Series Post 7

Today the post is about Bash. To be continued in All-In-One Programming Series Post 8.
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Bash

1. Advanced Bash-Scripting Guide
2. Bash Guide for Beginners by Machtelt Garrels
3. Lhunath's Bash Guide
4. The Command Line Crash Course (also a Powershell reference)
5. Bash Books