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