test.sh

#!/bin/bash

itemcount=0
subcount=1

for a in `ls G*.JPG 2> /dev/null`
do
	echo "$a"
	lastproduct="$productid"
	productid=`echo "$a" | gawk '{print substr($a, 9,6)}'`
	colorid=`echo "$a" | gawk '{print substr($a, 16,2)}'`
	echo "last was "$lastproduct
	echo "current is "$productid
	echo "color is "$colorid
	if [ "$lastproduct" != "$productid" ]
	then
		itemcount=0
	fi
	mkdir $productid/main -p
	mkdir $productid/color -p
	if [ $itemcount -eq 0 ]	
	then
		cp $a $productid/main/0.JPG
	else
		cp $a $productid/color/$colorid.JPG
	fi
	itemcount=`expr $itemcount + 1`
	echo $itemcount
done

for b in `ls *sub*.jpg 2> /dev/null`
do
	echo "$b"
	lastproduct="$productid"
	productid=`echo "$b" | gawk '{print substr($b, 1,6)}'`
	echo "last was "$lastproduct
	echo "current is "$productid
	if [ "$lastproduct" != "$productid" ]
	then
		subcount=1
	fi
	mkdir $productid/main -p
	cp $b $productid/main/$subcount.JPG

	subcount=`expr $subcount + 1`
	echo $subcount
done