Advanced Bash-Scripting Guide: A complete guide to shell scripting, using Bash
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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. 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
8. Operations and Related Topics
8.1. Operators
8.2. Numerical Constants
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Shell wrapper, self-executing script Exit and Exit Status