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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 and trapping signals for cleanup


Throughout this book, you have probably pressed Ctrl + C or Ctrl + Z without knowing what was occurring—it's just like pressing Ctrl + Alt + Delete in another OS, right? Well, in one regard, yes—it is a signal, but the action itself is very different in Linux. A signal at the hardware level is similar to a flag or some sort of immediate notification that says hey - something happened here. If the appropriate listener is set up, that signal can execute some sort of functionality. 

On the other hand, software signaling is far more flexible and we can use signals as simple notification mechanisms that are far more flexible than their hardware siblings. In Linux, Ctrl + C equates to SIGINT (program interrupt), which typically exits a program. It can be stopped, and other functionality such as cleanup can be executed. Ctrl + Z or SIGTSTP (keyboard stop) typically tells a program to be suspended and pushed to the background (more about jobs in a later...

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