mapper for S3 accesslog IP address check

ip_mapper.rb

#!/usr/bin/env ruby
ARGF.each do |line|

   line = line.chomp
   data = line.split(/ /)

   # IP address is 5th column if split by space
   ip = data[4]
   key = ip
  
   # value is a count of 1 occurence
   value = 1

   # output to STDOUT only if it were for /index.html access
   if data[8] == "index.html"
     puts key + "\t" + value.to_s
   end

end