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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

Introduction to Text-Stream Filters

As either a Linux systems administrator or an office worker who uses Linux on the desktop, you’ll probably have a certain number of text files that you need to work with. You may even get tasked with extracting data from these files and presenting the data effectively.

Or, you might need to extract data from utilities that show the status of your Linux system or from within scripts that automatically scrape the web for some specific information. The text-stream filter utilities that I present in this topic can help make these jobs easier. Once you learn them, you may even find that you can extract and display data with them more quickly than you could with text editors or word processors.

Figure 6.1: The basic concept of text-stream filters

With only one exception, you won’t use these utilities to modify the original text file. You’ll use them either to view the selected data on-screen, pipe the selected data...

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