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

Table of Contents
9. Variables Revisited
9.1. Internal Variables
9.2. Manipulating Strings
9.3. Parameter Substitution
9.4. Typing variables: declare or typeset
9.5. Indirect References
9.6. $RANDOM: generate random integer
9.7. The Double Parentheses Construct
10. Loops and Branches
10.1. Loops
10.2. Nested Loops
10.3. Loop Control
10.4. Testing and Branching
11. Command Substitution
12. Arithmetic Expansion
13. Recess Time
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Numerical Constants Variables Revisited