Binary on LEDs

#!/bin/bash
# Raspberry Pi and wiringpi
# Display byte as binary on leds connected to GPIO
# RPi GPIO
# MSB to LSB
# BCM    25 24 23 22 10 09 08 07
# HEADER 22 18 16 15 23 21 24 26
#
# gpio init
gpio=gpio
for P in 22 18 16 15 23 21 24 26; do
  $gpio mode $P out
done
echo -n "$1 to binary "
#MSB to LSB
if [ $(($1 & 128)) -eq 128 ]; then
  echo -n 1
  $gpio write 22 1
else
  echo -n 0
  $gpio write 22 0
fi
if [ $(($1 & 64)) -eq 64 ]; then
  echo -n 1
  $gpio write 18 1
else
  echo -n 0
  $gpio write 18 0
fi
if [ $(($1 & 32)) -eq 32 ]; then
  echo -n 1
  $gpio write 16 1
else
  echo -n 0
  $gpio write 16 0
fi
if [ $(($1 & 16)) -eq 16 ]; then
  echo -n 1
  $gpio write 15 1
else
  echo -n 0
  $gpio write 15 0
fi
if [ $(($1 & 8)) -eq 8 ]; then
  echo -n 1
  $gpio write 23 1
else
  echo -n 0
  $gpio write 23 0
fi
if [ $(($1 & 4)) -eq 4 ]; then
  echo -n 1
  $gpio write 21 1
else
  echo -n 0
  $gpio write 21 0
fi
if [ $(($1 & 2)) -eq 2 ]; then
  echo -n 1
  $gpio write 24 1
else
  echo -n 0
  $gpio write 24 0
fi
if [ $(($1 & 1)) -eq 1 ]; then
  echo -n 1
  $gpio write 26 1
else
  echo -n 0
  $gpio write 26 0
fi
echo