[Shell programming] copy files that are interested in

#!/bin/sh

path="rgbd_data"

cd ~/data
# pwd ~/data

for str in "ball" "food_box"
do
	for index in $(ls ./rgbd_data/$str/)
	do
		mkdir $str/$index
		cp ./rgbd_data/$str/$index/$index\_1_[1-9]_*.png ./$str/$index/
	done
done