[ -e "/sys/class/leds/$led/trigger" ] && \
echo "$trigger" > "/sys/class/leds/$led/trigger"
[ -e "/sys/class/leds/$led/brightness" ] && \
echo "$brightness" > "/sys/class/leds/$led/brightness"
[ -e "/sys/class/leds/$led/trigger" ] && \
echo "$trigger" > "/sys/class/leds/$led/trigger"
[ -e "/sys/class/leds/$led/brightness" ] && \
echo "$brightness" > "/sys/class/leds/$led/brightness"