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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

Obtaining Input from Text Files

As you might have already guessed, the default manner in which awk operates is to read a file line-by-line, searching for the specified pattern in each line. When it finds a line that contains the specified pattern, it will perform the specified action on that line. Let’s begin by building upon the passwd file example that I showed you in the previous section.

Looking for Human Users

The /etc/passwd file contains a list of all users on the system. What I’ve always found curious is that system user accounts and normal human user accounts are all mixed together in the same file. But, let’s say that as part of your administrator duties, you need to maintain a list of normal human users on each machine. One way to do that is to use awk to search through the passwd file for the User ID Numbers (UIDs) that correspond to human users. To find out what the UID numbers for normal users are, you can look in the /etc/login.defs file...

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