See the content:
cat /sys/class/leds/nsa325\:green\:sys/trigger
Turn off
Turn on
cat /sys/class/leds/nsa325\:green\:sys/trigger
none kbd-scrollock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock nand-disk usb-gadget usb-host timer oneshot ide-disk1 ide-disk2 heartbeat gpio [default-on]
Turn off
echo none > /sys/class/leds/nsa325\:green\:sys/trigger
Turn on
echo default-on > /sys/class/leds/nsa325\:green\:sys/trigger