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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

Understanding getopt versus getopts

The getopt utility, which has its own executable file, has been around forever, since the early days of Unix. Its big advantage is that it can handle long options. In other words, in addition to feeding it single-letter options, such as -a or -b, you can also feed it whole-word options such as --alpha or --beta. And, that’s it. That’s really its only advantage.

It also has some disadvantages. The original implementation of getopt can’t handle arguments that have blank spaces in their text strings. So, for example, if you need to work with a file that has a blank space in its filename, you can’t specify that filename as an argument for a shell script that uses the original getopt. Also, the getopt syntax is a bit trickier than that of getopts, which makes getopts somewhat easier to use.

At some point in time, I’m not sure when, some random Linux developers decided to create a new implementation of getopt...

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