User preference utility for X.
Disable the screensaver
xset s off
Disable the bell sound
xset b off
Set the screensaver to start after 60 minutes of inactivity
xset s 3600 3600
Disable DPMS (Energy Star) features
xset -dpms
Enable DPMS (Energy Star) features
xset +dpms
Query information on any X server
xset -display :0 q