analyze_access_log.rb

#!/usr/bin/env ruby

require 'optparse'

# Show prettier output on interrupt (ctrl+c)
trap("INT") do |s|
   puts
   exit(s)
end

ipLimit = 5
urlLimit = 20
OptionParser.new do |opts|
   opts.banner = "Usage: #{$0.split('/').last} [options] [FILE]"
   
   opts.on('-i', '--ip-limit NUM', Integer, "Only show the top NUM IPs. Defaults to #{ipLimit}.") do |num|
      ipLimit = num
   end

   opts.on('-u', '--url-limit NUM', Integer, "Only show URLs hit more than NUM times. Defaults to #{urlLimit}.") do |num|
      urlLimit = num
   end
   
   opts.on_tail('-h', '--help', 'Show this help dialog.') do
      puts opts
      exit 0
   end
end.parse!

file = ARGV[-1]

# These awk lines will change a little depending on your log format; here's ours:
# LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
lines = `awk '{print $7}' #{file} \
       | sort \
       | uniq -c \
       | grep -v '-' \
       | sort -n \
       | tail -n #{ipLimit}`.split("\n")
lines.each do |line|
   count, ip = line.split
   puts "#{count} requests from #{ip}"
   puts `grep '#{ip}' #{file} \
       | sed -r 's/([0-9\.]+), ([0-9\.]+)/\1,\2/' \
       | awk '{print $13}' \
       | sort \
       | uniq -c \
       | sort -n \
       | awk '{if ($1 > #{urlLimit}) {print}}'`
   puts "\n"
   puts '=' * 80
   puts "\n"
end

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