function sum_dir(){
path_txt=$(find $1 -iname "*ISO")
echo "" > $1/md5sum.txt
echo "" > $1/sha256sum.txt
for path in $path_txt
do
md5sum $path >> $1/md5sum.txt
sha256sum $path >> $1/sha256sum.txt
done
}



if [ $1 != "" ]; then
sum_dir $1
fi


if [ $2 != "" ]; then
sum_dir $2
fi

if [ $3 != "" ]; then
sum_dir $3
fi