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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
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25
Index

Defining a Function

You can define a function in the following places:

  • On the command-line
  • In a shell script
  • In a function library
  • In a shell configuration file

Defining a function from the command-line can be useful if you need to do any quick testing or experimentation with new code. Here’s what it looks like:

[donnie@fedora ~]$ howdy() { echo "Howdy, world!" ; echo "How's it going?"; }
[donnie@fedora ~]$ howdy
Howdy, world!
How's it going?
[donnie@fedora ~]$

The name of this function is howdy, and the () tells the shell that this is a function. The code for the function is within the pair of curly braces. The function consists of two echo commands, which are separated by a semi-colon. Note that you need to place another semi-colon at the end of the final command. You also need to have one blank space between the first curly brace and the first command, and the final semi-colon and the closing curly...

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