for file in <files>; do 
	[[ $? != 0 ]] && break
	echo -n "$file: "
	ext=$(cut -d. -f2 <<< "$file")
	base=$( stat -c '%y' "$file" | cut -d . -f 1 | tr : . )
	name="$base".${ext,,}; echo $name
    mv "$file" "$name"
done