close monitor under Linux

In X:  

  xset dpms force off

 

In console: 

  if [ ${TERM} = "linux" ]; then

      setterm -blank 1 -powersave powerdown

  fi

 

These need ACPI support, you can use cmd:

  cat /proc/acpi/info

to verify this feature.

This cmd should show "version: 20081214" similar string.