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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}