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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 cut

As its name implies, this handy utility is used to cut and display selected information from a text file. Think of it as something that will take a vertical slice of a text file and send it to the output of your choice. There are two ways to specify where you want to begin and end the slice. You can specify it either by specifying the starting and ending characters, or by specifying the fields.

To specify your slice by fields, you’ll need to use both the -d and -f switches. The -d switch will specify the delimiter, the character that separates the fields. That’s so that cut will know where each field begins and ends. The -f switch will specify which fields you want to look at. In this diagram, you see that I used cut to extract the user name and real name--fields 1 and 5--from the /etc/passwd file.

Figure 6.3: Using cut to view fields 1 and 5 of the passwd file

Since the fields in this file are separated by colons, I used -d: for the delimiter...

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