Disable Beaglebone Black flashing heartbeat LED
Disable the Beaglebone Black flashing LEDs temporarily or permanently:
Persistently (permanently) disable: add to /etc/rc.local
echo none > /sys/class/leds/beaglebone\:green\:usr0/trigger
echo none > /sys/class/leds/beaglebone\:green\:usr1/trigger
echo none > /sys/class/leds/beaglebone\:green\:usr2/trigger
echo none > /sys/class/leds/beaglebone\:green\:usr3/trigger
Temporary disable (till reboot):
echo none > /sys/class/leds/beaglebone:green:usr0/trigger