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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

Going dark with the daemon

Do you think doing daemons is a complex task? Yes it is, unless you use a nice utility called daemon. The task of this program is to daemonize other commands or script in a simple and neat way. Does this utility take any shortcuts? No, it just goes through all the steps we have already seen to detach a process from the controlling terminal, putting it in background, starting a new session, clearing the umask, and closing the old file descriptors. Well, doing it by ourselves in Bash coding will be quite a difficult task. This program makes everything straightforward, nothing to take care of manually. But there is a drawback: this is not a standard utility and must be installed by the user. Not a big issue indeed since many distributions such as Debian or Red Hat have a package for this utility.

Time to try this utility out, so let's take our write...

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