getting X resolution from ~/.xsession?

[Louis-David Mitterrand <vindex+lists-debian-x@apartia.org>]

Hi,

I'm trying to build a single ~/.xsession script for all my computers.
Depending on the screen resolution I'd startup my xterms and other
programs with a different geometry.

Is there a way to get at the X screen resolution from inside the
~/.xsession script? Maybe with xrandr? Or a better tool?

Thanks,