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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 Basic Shell Script Construction

The first thing you’ll need to do when creating a shell script is to define which shell you want to use to interpret the script.

You might have a particular reason for choosing one shell over another. That’s something we’ll talk about in Chapter 19, Shell Script Portability, and Chapter 22, Using the Z Shell.

You’ll define the shell to use as the interpreter in the shebang line, which is the first line of the script. It will look something like this:

#!/bin/bash

Normally of course, a line that begins with the # sign would indicate a comment that would be ignored by the shell. The shebang line--and please don’t ask me why it’s called that--is an exception to that rule. In addition to defining a specific shell that you want to use, such as /bin/bash or /bin/zsh, you can also define the generic /bin/sh shell to make your scripts more portable, so that they’ll run...

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