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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 unexpand

Now that I’ve told you what expand does, do I really need to tell you what unexpand does? That’s right, you guessed it. unexpand removes the blank spaces from between columns, and replaces them with tabs. There are a couple of slight catches, though. By default, unexpand only operates on spaces that are at the beginning of a line. That’s just the opposite of how expand works with tabs. So, if you want to replace all spaces in a line with tabs, you’ll need to use the -a switch. The second catch is that by default, unexpand only works if it sees eight consecutive blank spaces. Any grouping of fewer than eight consecutive blank spaces won’t get converted to tabs. (You can change that behavior with the -t switch, as you’ll see in a few moments.)

I’ll demonstrate by unexpanding the expand_2.txt file that I’ve just created in the expand section, using the -a option, like so:

[donnie@fedora ~]$ unexpand -a expand_2...

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