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BeagleBone Black Cookbook

You're reading from   BeagleBone Black Cookbook Over 60 recipes and solutions for inventors, makers, and budding engineers to create projects using the BeagleBone Black

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Product type Paperback
Published in Nov 2015
Publisher Packt
ISBN-13 9781783982929
Length 346 pages
Edition 1st Edition
Tools
Concepts
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Author (1):
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Charles A. Hamilton Charles A. Hamilton
Author Profile Icon Charles A. Hamilton
Charles A. Hamilton
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Table of Contents (11) Chapters Close

Preface 1. Setting Up for the First Time 2. Basic Programming Recipes FREE CHAPTER 3. Physical Computing Recipes Using JavaScript, the BoneScript Library, and Python 4. Exploring GNU/Linux Recipes Using Bash, Autotools, Debugger, and systemd 5. Basic Programming Recipes with the Linux Kernel 6. Run Faster, Run Real Time 7. Applied Recipes – Sound, Picture, and Video 8. The Internet of Things 9. The Black in Outer Space Index

Epoch Time shell script

Shell scripts

A shell script has a myriad of purposes on a Linux box. You can have them run at bootup so that they initiate commands or processes without you having to manually start them. They can be used to run a sequence of events. They can manipulate files, execute a program, print text, and walk your dog. Well, the last part is true if your dog is a robot. However, we're getting ahead of ourselves.

Epoch time, more commonly known as UNIX time (also POSIX time), is widely used in Linux (UNIX) systems as a way to describe instants in time. Specifically, it measures the number of seconds that have elapsed since January 1, 1970, and is used as a timestamp reference point.

With this shell script, we can quickly compare the Epoch time on our machine with the UTC that we are more accustomed to using.

How to do it...

Perform the following steps:

Unix time can be checked on most Unix systems by typing date +%s on the command line. Perform the following steps:

  1. First,...
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