You're reading from The Ultimate Linux Shell Scripting Guide Automate, Optimize, and Empower tasks with Linux Shell Scripting

Product type Paperback

Published in Oct 2024

Publisher Packt

ISBN-13 9781835463574

Length 696 pages

Edition 1st Edition

Languages

Bash

Tools

Linux

Concepts

Cybersecurity

Author (1):

Donald A. Tevault

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Table of Contents (26) Chapters

Preface

1. Getting Started with the Shell FREE CHAPTER

2. Interpreting Commands

3. Understanding Variables and Pipelines

4. Understanding Input/Output Redirection

5. Customizing the Environment

6. Text-Stream Filters – Part 1

7. Text Stream Filters – Part 2

8. Basic Shell Script Construction

9. Filtering Text with grep, sed, and Regular Expressions

10. Understanding Functions

11. Performing Mathematical Operations

12. Automating Scripts with here Documents and expect

13. Scripting with ImageMagick

14. Using awk – Part 1

15. Using awk – Part 2

16. Creating User Interfaces with yad, dialog, and xdialog

17. Using Shell Script Options with getops

18. Shell Scripting for Security Professionals

19. Shell Script Portability

20. Shell Script Security

21. Debugging Shell Scripts

22. Introduction to Z Shell Scripting

23. Using PowerShell on Linux

24. Other Books You May Enjoy

25. Index

Using Shell Script Debugging Tools and Techniques

There are a few different debugging tools that we can use, which include shellcheck, checkbashisms, and shall. We’ve already looked at them in Chapter 19—Shell Script Portability, so we won’t look at them again here. Instead, I’ll present some tools and techniques that we haven’t covered yet.

Using echo Statements

Sometimes, if you have a problem with a shell script that you can’t figure out, placing echo statements in strategic locations can help you find the problem.

You may see in other references that some people think of echo statements as the poor man’s debugging tool. That’s because echo is always available, and can be used if you can’t use anything else.

Back in Chapter 16, Creating User Interfaces with yad, dialog, and xdialog, I showed you the xdialog-hello2.sh script, which can automatically detect two things.