gistfile1.txt

require 'open-uri'                                                                   
require 'net/http'·                                                                  

sourcefile = "http://s3.amazonaws.com/*redacted*/old_site_product_images/product1.jpg"
                                                                                      
open(sourcefile) do |f|                                                              
  puts File.basename(f)                                                                                                            
end                  

# outputs: open-uri20120330-58981-1mny2cc