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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

By : Donald A. Tevault
4.9 (8)
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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

4.9 (8)
By: Donald A. Tevault

Overview of this book

Dive into the world of Linux shell scripting with this hands-on guide. If you’re comfortable using the command line on Unix or Linux but haven’t fully explored Bash, this book is for you. It’s designed for programmers familiar with languages like Python, JavaScript, or PHP who want to make the most of shell scripting. This isn’t just another theory-heavy book—you’ll learn by doing. Each chapter builds on the last, taking you from shell basics to writing practical scripts that solve real-world problems. With nearly a hundred interactive labs, you’ll gain hands-on experience in automation, system administration, and troubleshooting. While Bash is the primary focus, you'll also get a look at Z Shell and PowerShell, expanding your skills and adaptability. From mastering command redirection and pipelines to writing scripts that work across different Unix-like systems, this book equips you for real-world Linux challenges. By the end, you'll be equipped to write efficient shell scripts that streamline your workflow and improve system automation.
Table of Contents (26 chapters)
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24
Other Books You May Enjoy
25
Index

Introduction to Functions

As I’ve mentioned above, a function is a block of programming code that performs a specific task. What makes functions so cool is that they really cut down on the amount of code that you have to type. Instead of having to type in the same code every time you want to perform a task, you can just call the function, instead. This cuts down on the size of your scripts, and makes typing the script much less prone to error.

Also, after a function has been called the first time, it resides in system memory, which can enhance the performance of your scripts.

You can create functions that accept parameters from the main program, that return values to the main program, or that might do some stand-alone task that doesn’t involve either passing parameters or passing values. Learning to create functions is easy, because for the most part you’re just using the same coding techniques that I’ve already shown you. I mean, yeah, there are...

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