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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 Function Libraries

For a convenient way to make your functions reusable, just place them into a function library. Then, from within your scripts, call the desired libraries with either a source command or a dot command. If you’re the only one who will ever use the libraries, you can place them in your own home directory.

If you want to make them available for everyone, you can place them in a central location, such as in the /usr/local/lib/ directory.

For a simple demonstration, I’ve created the donnie_library file in the /usr/local/lib/ directory with two simple functions. It looks like this:

howdy_world() {
echo "Howdy, world!"
echo "How's it going?"
}
howdy_georgia() {
echo "Howdy, Georgia!"
echo "How's it going?"
}

(I live in the state of Georgia, which explains the second function.)

There’s no need to set the executable permission on this file, because it only contains code that...

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