[PyMOL] Executing pymol commands without x-windows?

Hi!

I would like to run pymol scripts on the command line only without 
invoking the x-window because there is no need to display the structures 
involved (and also no way because I will run this on a Linux computer 
cluster). I am only interested in the pymol text output that can be 
piped into an output file. For example like this:

Pymol.com script.pml > log.out

I just want to avoid the x-window coming up (and possible errors if it 
cannot).

Thanks for your input!

Cheers,
Tanja