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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 stdout

Let’s say that you want to look at the listing of files that are in a certain directory. Instead of piping the ls output into less, you want to create a text file of this listing so that you can print it later. Here’s a graphical representation of how it works:

Figure 4.1: How stdout works

Here’s what it looks like in practice, where I’m sending output from the ls command to the filelist.txt file:

[donnie@fedora ~]$ ls > filelist.txt
[donnie@fedora ~]$

As you can see, this is fairly simple. You can take pretty much any command that normally sends its output to the computer screen, and have it sent to a text file instead. There is one thing that you have to be careful with, though. If you redirect a command’s output to a file that already exists, you will overwrite it, and all previous information in that file will be lost. There are three ways to prevent this from happening.

Preventing File Overwrites...

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