[Raspberry Pi]LEDを点滅2

#!/bin/sh
gpio_number=25
echo "${gpio_number}" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio${gpio_number}/direction

echo "1" > /sys/class/gpio/gpio${gpio_number}/value
sleep 5
echo "0" > /sys/class/gpio/gpio${gpio_number}/value
echo "${gpio_number}" /sys/class/gpio/unexport

root@raspberrypi:/home/pi# sudo sh led.sh
25 /sys/class/gpio/unexport

期待通りに動きます。