#!/usr/bin/env python
"""
url retriever

Usage:
    
url_retrieve_urllib.py URL FILENAME

URL:
If the URL is an FTP URL the format should be:
ftp://[username[:password]@]hostname/filename
If you want to use absolute paths to the file to download,
you should make the URL look something like this:
ftp://user:password@host/%2Fpath/to/myfile.txt
Notice the '%2F' at the beginning of the path to the file.

FILENAME:
absolute or relative path to the filename to save downloaded file as
"""

import urllib
import sys

if '-h' in sys.argv or '--help' in sys.argv:
    print __doc__
    sys.exit(1)

if not len(sys.argv) == 3:
    print 'URL and FILENAME are mandatory'
    print __doc__
    sys.exit(1)
url = sys.argv[1]
filename = sys.argv[2]
urllib.urlretrieve(url, filename)