devolver () {
	clear
	echo "Ingrese el número del CD a devolver:"
	read index
	for line in $(cat $FILE)
	do
		if [ "$(echo $line | cut -d ":" -f1)" == "$index" ]
		then
			old=$line
		fi	
	done
	new=$(echo $old | cut -d ":" -f1,2,3,4):D::
# 	echo $old
# 	echo $new
# 	sleep 5
	sed -i -e "s/$old/$new/" $FILE
	echo "Devuelto!!!"
	sleep 2
}