Advanced Bash-Scripting Guide:
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Part 2. Basics

Table of Contents
3. Special Characters
4. Introduction to Variables and Parameters
4.1. Variable Substitution
4.2. Variable Assignment
4.3. Bash Variables Are Untyped
4.4. Special Variable Types
5. Quoting
6. Exit and Exit Status
7. Tests
7.1. Test Constructs
7.2. File test operators
7.3. Other Comparison Operators
7.4. Nested if/then Condition Tests
7.5. Testing Your Knowledge of Tests
8. Operations and Related Topics
8.1. Operators
8.2. Numerical Constants
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Preliminary Exercises Special Characters