[Nickelino]

@gammelobst: This script is very long and I'm not really good in shell scripting. So i cannot say where could be the issue with it.

I do not post the file here because it's too long.

Here is the Link to the file in the developer's git repository. I think it's basically the same:
runcommand.sh

EDIT: ...and thanks for your litte hint I said very bad because Steam says running in big picture mode that the graphics memory is too low and I found no way to increase it.... That's bad

Greetings

Nicke