Download all ebooks on http://hewgill.com/~greg/stackoverflow/ebooks

downloader.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'open-uri'
require 'nokogiri'
require 'net/http'

url = 'http://hewgill.com/~greg/stackoverflow/ebooks/'

root = uri.parse(url)
document = nokogiri::html(open(url))
ebooks = document.css("a").to_a.map { |link| link['href'] }
ebooks.delete_if {|e| e[0,2] != "st"}

net::http.start(root.host, root.port) do |http|
  ebooks.each do |ebook|
    puts "downloading... #{ebook}"
    resp = http.get("http://hewgill.com/~greg/stackoverflow/ebooks/#{ebook}")
    open(ebook, "wb") do |file|
      file.write(resp.body)
    end
    puts "download completed"
  end
end