gistfile1.rb

def parse_ip_string(line)
  line.scan(/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/).each do |addr|
    split_array = addr.split(".")	
    return split_array.map{ |str| str.rjust(3, '0') }.join '.'		
  end
  nil
end

unless ARGV.size == 1
  puts "Invalid number of arguments?"
else	
  filename = ARGV[0]
  ip_hash = Hash.new(0) 
  File.open(filename, 'r') do |in_file|
    in_file.each_line do |line|	
      ip_string = parse_ip_string(line)	
      if ip_hash.key?(ip_string) # the ip_string was found
        ip_hash[ip_string] += 1
      else
        ip_hash[ip_string] = ip_hash.default
      end
    end
  end
end