#!/usr/bin/env python
from urllib2 import urlopen
from sys import argv, exit
from re import findall

def main(URL):
  html = urlopen(URL).read()
  links = findall(r'<a href="(\S+)">', html)
  f = open('URLs.txt', 'w')
  for link in links:
    f.write(link + '\n')

if __name__ == '__main__':
  if len(argv) == 2:
    main(argv[1])
  else:
    exit('Usage: ./scrape.py URL')