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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

Creating Simple Firewall Scripts

In this scenario, you need to create a text file with a list of IP addresses that you want to block. You then need to create a shell script that will read that list of IP addresses, and then create firewall rules that will block them. There are two ways that you can do this. First, there’s the hard way. And then, there’s the easy way.

The hard way consists of reading the list of addresses into a variable array, and then creating a for loop that will create a blocking rule for each IP address that’s in the array. Okay, it’s not that hard, but it is a bit harder than we would like. (I’ll show you the easy way after I show you the hard way. That way, you’ll be more appreciative of the easy way.)

Creating an IP Address Blocking Script for Red Hat Distros

Red Hat-type distros, such as Fedora, AlmaLinux, Rocky Linux, Oracle Linux, and of course Red Hat Enterprise Linux, use firewalld as their firewall...

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