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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

Understanding Regular Expressions

When you worked with the text-stream filters in Chapter 6, Text Stream Filters Part 1 and Chapter 7, Text Stream Filters Part 2, you were manipulating simple text strings. That is, you were working with alphabetic characters, numbers, and the control characters that allow you to place tabs, spaces, and newlines into your text files. Regular Expressions, which you’ll sometimes see shortened to either regexp or regex, can include text strings, or even be a text string. They can also include special characters, collectively called metacharacters, which give such awesome power to the tools that understand them. In fact, you can think of Regular Expressions as a sort of programming language, with text strings as the words and metacharacters as the punctuation. Rather than just enabling you to search for simple text strings, regular expressions allow you to search for patterns. For example, if you need to search through a file for all telephone numbers...

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