This post follows up on Part 1 by examining the many ways that you can test the value of variables – e.g., whether they equal particular strings like “yes” or “no”, if they have a numeric value, if ...

If you run into problems building, testing or running complex bash scripts, don’t lose heart. There are many ways you can help ensure that your scripts will work flawlessly. In this post, we’ll ...

I've recently written about using bash arrays and bash regular expressions, so here's a more useful example of using them to test IP addresses for validity. To belabor the obvious: IP addresses are 32 ...

In this tutorial, you will learn how to write Bash scripts that run on Ubuntu and encode and package multiple files to HLS/DASH output using open-source tools FFmpeg and Bento4. You’ll learn how to ...

If you are building a robot, sensor platform, weather station then you don’t want the code to stop running when you disconnect from the terminal, and nohup is just the thing for you.In this how-to, we ...

Testing is an integral and important part of any software development cycle, open or closed, and Linux kernel is no exception to that. Developer testing, integration testing, regression, and stress ...

You need to package up a bunch of files, send them somewhere, and do something with them at the destination. It isn’t an uncommon scenario. The obvious answer is to create an archive — a zip or tar ...

I have the following bash script which tests 2 jpgs and displays a message if they are different.<br><br> diff -a --brief fullsize.jpg fullsize.jpg.bak<br> echo "diff=$?"<br> if [ $? -eq 1 ]; then<br> ...

FFmpeg was designed as a cross-platform solution for video and audio recording, conversion, and streaming. Its About page describes the command-line tool as “the leading multimedia framework, able to ...