random.rb

#!/usr/bin/env ruby

if $*.length < 2
  $stderr.puts "Usage: random.rb MIN_NUMBER MAX_NUMBER [QUALITY]"
  exit
end

range = Range.new($*[0].to_i, $*[1].to_i)
quality = $*[2] != nil ? $*[2].to_i : 10

random_reader = File.new("/dev/urandom")

number = 0

until range === number || number > range.end
  read = random_reader.read(quality)
  i = quality
  read.each_byte do |byte|
    number += byte * i
    i -= 1
  end
end

puts number % range.end