#!/bin/bash

LABEL_FILE=$(grep -l pcf8574a /sys/class/gpio/*/*label)
BASE_FILE="$(dirname $LABEL_FILE)/base"
BASE=$(cat $BASE_FILE)

for (( i=0; i<=7; i=i+1 )); do
    PIN[$i]=$(($BASE+$i))
    echo "${PIN[$i]}"
    echo "${PIN[$i]}" > /sys/class/gpio/export
    echo "out" > /sys/class/gpio/gpio${PIN[$i]}/direction
    echo "1" > /sys/class/gpio/gpio${PIN[$i]}/value

done

#if [ ! -e "/sys/class/gpio/gpio${PIN[7]}/value" ]; then 
#    echo "${PIN[7]}" > /sys/class/gpio/unexport
#fi