raspberry pi screen on/off script

#!/bin/sh

# Enable and disable HDMI output on the Raspberry Pi

case $1 in
        off)
                xset dpms force standby
                vcgencmd display_power 0
        ;;
        on)
                vcgencmd display_power 1
        ;;
        *)
                echo "Usage: $0 on|off" >&2
                exit 2
        ;;
esac

exit 0