passcode

#!/usr/bin/env node

// usage: passcode [<length>]

var crypto = require('crypto')

function randomPasscode(length) {
  var passcode = ''

  for (var i = 0; i < length; i++) {
    passcode += Math.floor(crypto.randomBytes(1).readUInt8() * 10 / 0x100)
  }

  return passcode
}

function main() {
  if (process.argv[2] === '--help' || process.argv[2] === '-h' ||
      process.argv[2] === '-?') {
    console.log('usage: passcode [<length>]\n')
    process.exit()
  }

  console.log(randomPasscode(+process.argv[2] || 11))
}

if (require.main === module) {
  main()
}