dest='ratelimit', metavar='L', help='download rate limit (e.g. 50k or 44.6m)')
parser.add_option('-a', '--batch-file',
dest='batchfile', metavar='F', help='file containing URLs to download')
dest='ratelimit', metavar='L', help='download rate limit (e.g. 50k or 44.6m)')
parser.add_option('-a', '--batch-file',
dest='batchfile', metavar='F', help='file containing URLs to download')