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The Ultimate Linux Shell Scripting Guide

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

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Product type Paperback
Published in Oct 2024
Publisher Packt
ISBN-13 9781835463574
Length 696 pages
Edition 1st Edition
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Author (1):
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Donald A. Tevault Donald A. Tevault
Author Profile Icon Donald A. Tevault
Donald A. Tevault
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Table of Contents (26) Chapters Close

Preface 1. Getting Started with the Shell 2. Interpreting Commands FREE CHAPTER 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

Executing Multiple Commands at Once

From either the command-line or from within shell scripts, it’s handy to know how to combine multiple commands into one single command. In this section, I’ll demonstrate three ways to do that which are:

  • Running commands interactively
  • Using command sequences
  • Using the find utility

Running Commands Interactively

This is a form of shell-script programming, except that you’re just executing all commands from the command-line, instead of actually writing, saving, and executing a script. Here, you are creating a for loop – with each command of the loop on its own separate line – to perform a directory listing three times.

[donnie@fedora ~]$ for var in arg1 arg2 arg3
> do
> echo $var
> ls
> done
. . .
. . .
[donnie@fedora ~]$

At the end of each line, you’ll hit the Enter key. But, nothing will happen until you type the done command on the final line. The...

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The Ultimate Linux Shell Scripting Guide
Published in: Oct 2024
Publisher: Packt
ISBN-13: 9781835463574
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