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
5.1. Quoting Variables
5.2. Escaping
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
8.3. The Double-Parentheses Construct
8.4. Operator Precedence
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Preliminary Exercises Special Characters