random-passwords.rb

#!/usr/bin/env ruby

password_length = (ARGV[0] || 16).to_i
symbol_count = (ARGV[1] || 2).to_i
alphanumerics = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a
symbols = "~`!@##$%^&-=_+()[]{};:,.".chars

50.times do
  password = password_length.times.collect { alphanumerics[Random.rand(0...alphanumerics.length)] }.join
  symbol_count.times { password[Random.rand(0...password.length)] = symbols[Random.rand(0...symbols.length)] }
  puts password
end