Blink LED slightly fancier code that removes error messages

blink.sh

#!/bin/bash
#
# My Blinky Code
#
###############

echo 49 > /sys/class/gpio/export 2> /dev/null
echo 214 > /sys/class/gpio/export 2> /dev/null
echo low > /sys/class/gpio/gpio214/direction
echo 256 > /sys/class/gpio/export 2> /dev/null
echo high > /sys/class/gpio/gpio256/direction
echo high > /sys/class/gpio/gpio214/direction
echo out > /sys/class/gpio/gpio49/direction

mode=0

while :
do
  echo $mode > /sys/class/gpio/gpio49/value
  sleep 1
  mode=$((($mode+1) % 2))
done