Disable Beaglebone Black flashing heartbeat LED

Persistently (permanently) disable Beaglebone black flashing heartbeat LED by adding 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

Reference

temporary disable heartbeat LED (only until rebooting)

sudo -s
echo none > /sys/class/leds/beaglebone:green:usr0/trigger
exit

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