parser.add_argument('-o', '--older', required=True, type=int,
help='remove files older than this (in days)')
parser.add_argument('start_dir', help='start from this directory')
parser.add_argument('-o', '--older', required=True, type=int,
help='remove files older than this (in days)')
parser.add_argument('start_dir', help='start from this directory')