This is some code for querying/changing MacOS screen resolution that I found in multiple versions around the web. It seemed useful, and as though it ought to be rescued, so I put it in a proper repository and tried to reconstruct its revision history.
I am not supporting or maintaining this code, but if you find a compelling improvement, I might be inclined to accept your pull request ;-)
This produces lots of warnings, but seems to work for me.
c++ setgetscreenres.m -framework ApplicationServices -o ~/bin/setgetscreenres -arch i386—Dave