Disable Beaglebone Black flashing heartbeat LED

Temporary disable (till reboot):

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

Persistently (permanently) disable:

crontab -e

@reboot ...

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