Ruby script to retrieve and display Comcast data usage. See http://www.128bitstudios.com/2011/08/27/comcast-data-usage-put-a-fork-in-it/

capmon.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'mechanize'

URL_PRELOADER = 'https://customer.comcast.com/Secure/Preload.aspx?backTo=%2fSecure%2fUsers.aspx&preload=true'
URL_USERS = 'https://customer.comcast.com/Secure/Users.aspx'
URL_ACCOUNT = 'https://customer.comcast.com/Secure/Account.aspx'

abort "Usage: #{$0} <username> <password>" unless ARGV.length == 2

agent = Mechanize.new

agent = Mechanize.new { |agent|
  agent.follow_meta_refresh = true
  agent.redirect_ok = true
  agent.user_agent = 'Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6'
}

login_page = agent.get(URL_USERS)

login_form = login_page.form_with(:name => 'signin')
login_form.user = ARGV[0]
login_form.passwd = ARGV[1]

redirect_page = agent.submit(login_form)
redirect_form = redirect_page.form_with(:name => 'redir')

abort 'Error: Login failed' unless redirect_form

account_page = agent.submit(redirect_form, redirect_form.buttons.first)

agent.get(URL_PRELOADER)
users_page = agent.get(URL_USERS)
usage_text = users_page.search(".usage-graph-legend").text

puts usage_text.strip

users_page = agent.get(URL_ACCOUNT)
date_range = users_page.search('//h3').select { |tag| tag.text =~ /Current Bill/ }.first

date_range_text = date_range.search('//small').text

puts date_range_text.strip