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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
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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