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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

Using here Documents

A here document is a block of code that you place into a script to perform a certain task. Yeah, I know, I said the same thing about functions. But, here documents are completely different. They’ve been around since the early days of Unix, and can be used in various different programming languages.

Formatting note: The accepted Unix and Linux convention for writing out the term “here document” is to do so in all lower-case letters. That can get a bit confusing, though. So, to eliminate the confusion, I’ll just italicize the term throughout the rest of this book, like this: here document.

Here documents work by providing another way to redirect input into a particular command. The code that performs this redirection is enclosed by a pair of limit strings, which look something like this:

command << _EOF_
. . .
Code to execute or data to display
. . .
_EOF_

The << sequence is a special type of redirector...

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