A ruby script for download all railscasts episodes from rss

railscasts.rb

#!/usr/bin/env ruby

begin
  require 'rubygems'
rescue LoadError
end
require 'nokogiri'
require 'open-uri'

f = open('http://feeds.feedburner.com/railscasts')

episodes = Nokogiri::XML(f).root.xpath('channel').xpath('item')

episodes.each do |e|
  c = e.at_xpath('enclosure')
  url = c['url']

  name = url.match('videos.(.*)')

  unless File.exists?(name[1])
    %x(wget -c #{url})
  end
end