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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

Understanding Array Variables

An array allows you to collect a list into one variable. The easy way to create an array variable is to assign a value to one of its indices, like so:

name[index]=value

Here, name is the name of the array, and index is the position of the item in the array. (Note that index must be a number.) value is the value that’s set for that individual item in the array.

The numbering system for arrays begins with 0. So, name[0] would be the first item in the array. To create an indexed array, use declare with the -a option, like so:

[donnie@fedora ~]$ declare -a myarray
[donnie@fedora ~]$

Next, let’s create the list that will be inserted into the array, like so:

[donnie@fedora ~]$ myarray=(item1 item2 item3 )
[donnie@fedora ~]$

You can view the value of any individual item in the array, but there’s a special way to do it. Here’s what it looks like:

[donnie@fedora ~]$ echo ${myarray[0]}
item1
[donnie...
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The Ultimate Linux Shell Scripting Guide
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