Generate XKCD style passwords on OS X

password.rb

#!/usr/bin/env ruby

number_of_words = ARGV[0].to_i
number_of_words ||= 4

dictionary = File.read('/usr/share/dict/web2a').split
words = []

until words.length == number_of_words do
  word = dictionary[rand(dictionary.size)]
  next unless word.size <= 6
  words << word.strip
end

puts words.join(' ')