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  • Book Overview & Buying The Ultimate Linux Shell Scripting Guide
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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

By : Donald A. Tevault
4.9 (7)
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The Ultimate Linux Shell Scripting Guide

The Ultimate Linux Shell Scripting Guide

4.9 (7)
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 (27 chapters)
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26
Index

Resizing and Customizing Images

Let’s say that I want to downsize my image to 1000x1000 pixels. I would do it like this:

[donnie@fedora script_test]$ convert -resize 1000x1000 S1180001.jpg S1180001_small.jpg
[donnie@fedora script_test]$

By default, the convert command maintains the original aspect ratio of the image. So, the size of my downsized image is actually 1000x563 pixels, as you see here:

[donnie@fedora script_test]$ identify S1180001_small.jpg
S1180001_small.jpg JPEG 1000x563 1000x563+0+0 8-bit sRGB 328914B 0.000u 0:00.000
[donnie@fedora script_test]$

Instead of specifying the size by pixels, you can specify the desired size in terms of a percentage of the original size, like so:

[donnie@fedora script_test]$ convert -resize 20% S1180001.jpg S1180001_small2.jpg
[donnie@fedora script_test]$

Now when I display the image, it will actually fit on my computer screen. Here’s how it looks:

B21693_13_4

Figure 13.4: Goldie, sleeping in my bedroom...

CONTINUE READING
83
Tech Concepts
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Programming languages
73
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The Ultimate Linux Shell Scripting Guide
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