Download 12 years stock history data from: http://markets.chron.com/chron/markets

chron.rb

require 'fileutils'
require 'open-uri'

class Chron
  def initialize(symbol)
    @symbol = symbol
  end

  def grab_year(year)
    url = "http://markets.chron.com/chron/action/gethistoricaldata?Month=12&Symbol=#{@symbol}&Range=12&Year=#{year}"
    open("#{@symbol}/#{@symbol}_#{year}.csv", 'w') do |file|
      file << open(url).read
    end
    puts "Downloaded: #{@symbol}_#{year}.csv"
  end

  def grab_data
    (0..12).each do |y|
      grab_year(y.to_s.rjust(2, '0'))
    end
  end
end

##############
#    MAIN    #
##############
if ARGV.length() < 1
  puts "Usage: " + __FILE__ + " symbol"
  exit
end

symbol = ARGV[0]
FileUtils.mkdir symbol 
chron = Chron.new(symbol)
chron.grab_data
puts "Completed: #{symbol}"