How to control onboard leds of Orange Pi Zero

The Orange Pi Zero has two onboard LED, a red one and a green one. You can control them using sysfs interface. In general you can use a sysfs interface of the gpio driver but since these two leds are reserved by the LED driver you can only use this way

echo 1 > /sys/class/leds/red_led/brightness

echo 0 > /sys/class/leds/red_led/brightness

echo 1 > /sys/class/leds/green_led/brightness

echo 0 > /sys/class/leds/green_led/brightness