Bash Programming and Shell Scripts
Bash Prompt HOWTO:
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Chapter 3. Bash Programming and Shell Scripts

Table of Contents
3.1. Variables
3.2. Quotes and Special Characters
3.3. Command Substitution
3.4. Non-Printing Characters in Prompts
3.5. Sourcing a File
3.6. Functions, Aliases, and the Environment
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Setting the PS? Strings Permanently Variables