Basically, is there a command (non-GUI) to detect the monitor brand. Let's say either IBM or ViewSonic.
It would help us help you if you told us why
you want to do this.
There's the read-edid
utility. Install it, try it, but I never had much fun with it.
You can also try:
Shutting down X then restarting it with
startx -- -logverbose 6
then look at the logfile /var/log/Xorg.0.log
where you'll find information on the monitor, as reported by itself and interpreted by xorg.
Please put your distro in your LQ profile (See mine, at the left?), or at least mention it. It matters.