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Mastering Bash

You're reading from   Mastering Bash A Step-by-Step Guide to working with Bash Programming and Shell Scripting

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781784396879
Length 502 pages
Edition 1st Edition
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Author (1):
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Giorgio Zarrelli Giorgio Zarrelli
Author Profile Icon Giorgio Zarrelli
Giorgio Zarrelli
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Table of Contents (15) Chapters Close

Preface 1. Let's Start Programming FREE CHAPTER 2. Operators 3. Testing 4. Quoting and Escaping 5. Menus, Arrays, and Functions 6. Iterations 7. Plug into the Real World 8. We Want to Chat 9. Subshells, Signals, and Job Controls 10. Lets Make a Process Chat 11. Living as a Daemon 12. Remote Connections over SSH 13. Its Time for a Timer 14. Time for Safety

CLI, passing the arguments to the command line

Geopts is a Bash built-in widely used to efficiently parse switches and arguments passed on the command line of a script. We already saw other ways to accomplish this task, but getops makes it quite easy to handle it, since it can automatically recognize the switches and argument passed to the script. Its syntax is as follows:

getops options variable

The first thing we pass to getops is a string of options, the classical -a -x -f of whatever you want, without any leading dash, such as getops axf or also getops ax:f. If you see an option followed by a colon, this means that the option is meant to have an argument such as follows:

./our_script.sh -x our_argument -a

In our example, -x has an argument while -a is a simple switch, or we can also call it flag that can just be there or not, but it does not require any arguments. The options...

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