Enable/disable your Raspberry PI HDMI output

rpi-hdmi.sh

#!/bin/sh

is_hdmi_output_off ()
{
	tvservice -s | grep "TV is off" >/dev/null
}

case $1 in
	stop)
		tvservice -o
	;;
	start)
		if is_hdmi_output_off
		then
			tvservice -p
			curr_vt=`fgconsole`
			if [ "$curr_vt" = "1" ]
			then
				chvt 2
				sleep 0.1
				chvt 1
			else
				chvt 1
				sleep 0.1
				chvt "$curr_vt"
			fi
		fi
	;;
	status)
		if is_hdmi_output_off
		then
			echo "HDMI output is off"
		else
			echo "HDMI output is on"
		fi
	;;
	*)
		echo "Usage: $0 start|stop|status" >&2
		exit 2
	;;
esac

exit 0