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Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell.

The Bash Beginner's Guide provides beginners with a simple introduction to the basics, and experts will find advanced details they need.

In this you will see the following things below.

Table of Contents

Introduction
1. Why this guide?
2. Who should read this book?
3. New versions, translations and availability
4. Revision History
5. Contributions
6. Feedback
7. Copyright information
8. What do you need?
9. Conventions used in this document
10. Organization of this document

1. Bash and Bash scripts
1.1. Common shell programs
1.2. Advantages of the Bourne Again SHell
1.3. Executing commands
1.4. Building blocks
1.5. Developing good scripts
1.6. Summary
1.7. Exercises

2. Writing and debugging scripts
2.1. Creating and running a script
2.2. Script basics
2.3. Debugging Bash scripts
2.4. Summary
2.5. Exercises

3. The Bash environment
3.1. Shell initialization files
3.2. Variables
3.3. Quoting characters
3.4. Shell expansion
3.5. Aliases
3.6. More Bash options
3.7. Summary
3.8. Exercises

4. Regular expressions
4.1. Regular expressions
4.2. Examples using grep
4.3. Pattern matching using Bash features
4.4. Summary
4.5. Exercises

5. The GNU sed stream editor
5.1. Introduction
5.2. Interactive editing
5.3. Non-interactive editing
5.4. Summary
5.5. Exercises

6. The GNU awk programming language
6.1. Getting started with gawk
6.2. The print program
6.3. Gawk variables
6.4. Summary
6.5. Exercises

7. Conditional statements
7.1. Introduction to if
7.2. More advanced if usage
7.3. Using case statements
7.4. Summary
7.5. Exercises

8. Writing interactive scripts
8.1. Displaying user messages
8.2. Catching user input
8.3. Summary
8.4. Exercises

9. Repetitive tasks
9.1. The for loop
9.2. The while loop
9.3. The until loop
9.4. I/O redirection and loops
9.5. Break and continue
9.6. Making menus with the select built-in
9.7. The shift built-in
9.8. Summary
9.9. Exercises

10. More on variables
10.1. Types of variables
10.2. Array variables
10.3. Operations on variables
10.4. Summary
10.5. Exercises

11. Functions
11.1. Introduction
11.2. Examples of functions in scripts
11.3. Summary
11.4. Exercises

12. Catching signals
12.1. Signals
12.2. Traps
12.3. Summary
12.4. Exercises

A. Shell Features
A.1. Common features
A.2. Differing features

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