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Bash Cookbook

You're reading from   Bash Cookbook Leverage Bash scripting to automate daily tasks and improve productivity

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Product type Paperback
Published in Jul 2018
Publisher Packt
ISBN-13 9781788629362
Length 264 pages
Edition 1st Edition
Languages
Tools
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Authors (2):
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 Brash Brash
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Brash
Ganesh Sanjiv Naik Ganesh Sanjiv Naik
Author Profile Icon Ganesh Sanjiv Naik
Ganesh Sanjiv Naik
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Toc

Table of Contents (15) Chapters Close

Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
1. Crash Course in Bash FREE CHAPTER 2. Acting Like a Typewriter and File Explorer 3. Understanding and Gaining File System Mastery 4. Making a Script Behave Like a Daemon 5. Scripts for System Administration Tasks 6. Scripts for Power Users 7. Writing Bash to Win and Profit 8. Advanced Scripting Techniques 1. Other Books You May Enjoy Index

Generating datasets and random files of various size


Usually, data that mimics real-world data is always the best, but sometimes we need an assortment of files of various content and size for validation testing without delay. Imagine that you have a web server and it is running some sort of application that accepts files for storage. However, the files have a size limit being enforced. Wouldn't it be great to just whip up a batch of files in an instant?

To do this, we can use some few file system features such as /dev/random and a useful program called dd. The dd command is a utility that can be used to convert and copy files (including devices due to Linux's concept of everything is a file, more or less). It can be used in a later recipe to back up data on an SD card (remember your favorite Raspberry Pi project?) or to "chomp" through files byte by byte without losses. Typical minimal dd usage can be $ dd if="inputFile" of="outputFile" bs=1M count=10. From this command, we can see:

  • if=: Stands...
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