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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 stderr

The redirector operators for stderr are 2> and 2>>. If you’re wondering why, it’s because of the file descriptor ID numbers that we looked at a few pages ago. The ID number for stderr just happens to be 2. As always, here’s the graphical representation:

Figure 4.3: How stderr works

If you run a command and something goes wrong, it will output an error message via stderr. By default, this message will get sent to the computer screen. Also by default, stderr messages get mixed in with stdout messages. So, if your command outputs both good data and error messages, you’ll have to scroll through the output messages on your screen to separate the two. Fortunately, you can use redirectors to change that behavior. To show how this works, let’s take another look at the find utility that we discussed in Chapter 2, Interpreting Commands.

If you’re logged on to a computer as a normal user and you use find...

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