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Advanced Bash-Scripting Guide:
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Part 3. Beyond the Basics

Table of Contents
9. Another Look at Variables
9.1. Internal Variables
9.2. Typing variables: declare or typeset
9.3. $RANDOM: generate random integer
10. Manipulating Variables
10.1. Manipulating Strings
10.2. Parameter Substitution
11. Loops and Branches
11.1. Loops
11.2. Nested Loops
11.3. Loop Control
11.4. Testing and Branching
12. Command Substitution
13. Arithmetic Expansion
14. Recess Time
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Operator Precedence Another Look at Variables