Advanced Bash-Scripting Guide: A complete guide to shell scripting
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Part 2. Basics

Table of Contents
3. Exit and Exit Status
4. Special Characters
5. Introduction to Variables and Parameters
5.1. Variable Substitution
5.2. Variable Assignment
5.3. Bash Variables Are Untyped
5.4. Special Variable Types
6. Quoting
7. Tests
7.1. Test Constructs
7.2. File test operators
7.3. Comparison operators (binary)
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   Exit and Exit Status