Blinking BeagleBoard-XM LED (Shell Script)

OLD=`cat /sys/class/leds/beagleboard\:\:usr0/trigger`

echo “Valor atual: $OLD”

echo “none” > /sys/class/leds/beagleboard\:\:usr0/trigger

while :;
do

echo 0 > /sys/class/leds/beagleboard\:\:usr0/brightness
sleep 1
echo 1 > /sys/class/leds/beagleboard\:\:usr0/brightness
sleep 1

done