Running Calculix examples from Github on windows 10?

I’m looking at the examples from Github mkraska.
I noticed that the fbd files include linux sys commands.
The cp has to be changed to copy, that is given, but for example
calculix/mkraska/tree/master/Contact/CNC rod.fbd.

Can I somehow stop it from opening the model viewer
or just say close after copying the mesh to inp-file?
The line “hcpy png Refs/rod” tries to create a picture of the model, but I think it’s not necessary.