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  • Book Overview & Buying The Ultimate Linux Shell Scripting Guide
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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

Looking at Some Real-World Examples

In this section, I’ll show you some practical, real-life things that you can do with some of the techniques that we’ve covered so far. Actually, rather than just showing you, I’ll let you get your hands dirty with some cool hands-on labs.

Hands-on Lab: Using if..then

This is absolutely a real-life example. Several years ago, I created this script as a plug-in for the Nagios network monitoring system. The scenario was that we wanted to make sure that malicious hackers haven’t added a rogue UID 0 account to the /etc/passwd file on Linux and FreeBSD machines. That’s because any account with a UID setting of 0 in the passwd file has full root privileges, and we don’t want any unauthorized accounts to have root privileges.

The problem is that on Linux machines there’s only supposed to be one user account with UID 0, and on FreeBSD there are two accounts with UID 0. (One UID 0 account is named...

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