Has anyone wrote a script that writes any info to sidecar?

[aegoreev at gmail.com]

Hello,

I am thinking of writing a script that would read GPS coordinates from a video 
file using mediainfo and paste them to xmp sidecar for digiKam to be able to 
read.
I am looking for a starting point. Does anyone have a script that writes 
something in a text file?

I will probably be using MediaInfo to read the coordinates.

mediainfo FILE | grep "©xyz" | head -n 1

Thank you in advance for any ideas.