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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

By : Donald A. Tevault
4.8 (5)
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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

4.8 (5)
By: Donald A. Tevault

Overview of this book

Embark on a comprehensive journey through command shells with this hands-on manual. While Bash is a Linux staple, Z shell and PowerShell are rising stars, applicable to Linux, macOS, and Unix. Progress seamlessly through chapters, each building on the last, creating a solid foundation. Learn through a unique approach: concepts, examples, and interactive labs. These labs, nearly a hundred strong, form the core of experiential learning, essential for script creation. Focusing on Linux commands and their scripting applications, this manual is universally relevant across Linux and select Unix-like systems. It goes beyond theory, offering practical scripts for real-world Linux administration. Scripts are designed for manageability, aiding learning and troubleshooting. The goal is to nurture the ability to craft intelligent, functional shell scripts. While centered on Bash, this book offers a peek into the future with Z Shell and PowerShell, expanding your skills and adaptability. This book is systematically structured and engaging so that it will guide you to master command shells, equipping you for real-world Linux challenges.
Table of Contents (26 chapters)
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24
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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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