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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

By : Donald A. Tevault
4.9 (8)
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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

4.9 (8)
By: Donald A. Tevault

Overview of this book

Dive into the world of Linux shell scripting with this hands-on guide. If you’re comfortable using the command line on Unix or Linux but haven’t fully explored Bash, this book is for you. It’s designed for programmers familiar with languages like Python, JavaScript, or PHP who want to make the most of shell scripting. This isn’t just another theory-heavy book—you’ll learn by doing. Each chapter builds on the last, taking you from shell basics to writing practical scripts that solve real-world problems. With nearly a hundred interactive labs, you’ll gain hands-on experience in automation, system administration, and troubleshooting. While Bash is the primary focus, you'll also get a look at Z Shell and PowerShell, expanding your skills and adaptability. From mastering command redirection and pipelines to writing scripts that work across different Unix-like systems, this book equips you for real-world Linux challenges. By the end, you'll be equipped to write efficient shell scripts that streamline your workflow and improve system automation.
Table of Contents (26 chapters)
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24
Other Books You May Enjoy
25
Index

Using Floating Point Math and printf

For some strange reason, you’ve found yourself working a job that requires you to keep track of weather-related statistics. Your boss has just sent you a text file that contains a list of temperatures. Some of the temperatures are Celsius temperatures, and some are Fahrenheit temperatures. Your assigned task is to convert the Fahrenheit temperatures to Celsius temperatures. You can do that the hard way by using a calculator to manually convert each Fahrenheit temperature, or you can write a script that will automate the process. You’ve decided that it would be easier to write a script. The list of temperatures is in the temps.txt file, which looks like this:

Temperature Celsius_or_Fahrenheit
32 F
212 F
-40 F
-14.7 F
24.6111 C
75.8 F
55.21 F
23.9444 C
29.8 F
104.34 F
98.6 F
23.1 C

The first three temperatures are checks to verify that the script works correctly. We know that 32 degrees F equals 0 degrees C, that 212 degrees...

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The Ultimate Linux Shell Scripting Guide
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