I have a small shell script that plays a little jingle and displays a notification whenever I get a new email.
The problem is that this shell script can get invoked anytime - including when I'm watching a DVD / video in fullscreen mode with the sound turned up quite a bit - which is quite annoying.
I'd like to enhance this script with the ability to detect whether an application is in fullscreen mode. I know this must be somehow possible because notifications don't display under those circumstances.
What command can I use?