How to trun off - on monitor using linux command

$xset dpms force off
$xset -dispaly:0 dpms force suspend
$xset -dispaly:0 dpms force off
$xset -dispaly:0 dpms force on
To control Energy Star (DPMS) features:
-dpms Energy Star features off
+dpms Energy Star features on
dpms [standby [suspend [off]]]
force standby
force suspend
force off
force on
(also implicitly enables DPMS features)
a timeout value of zero disables the mode


[to on after 1 min.]
$echo "xset -dispaly:0 dpms force on" | at "NOW + 1 minutes"
$echo "xset dpms force on" | at "NOW + 1 minutes"