var argv = process.argv
if (argv.length < 3) {
  console.error('Usage: read-package.json <file> [<fields> ...]')
  process.exit(1)
}

var file = argv[2]
var readJson = require('read-package-json')

readJson(file, function (er, data) {
  if (er) throw er
  if (argv.length === 3) {
    console.log(data)
  } else {
    argv.slice(3).forEach(function (field) {
      field = field.split('.')
      var val = data
      field.forEach(function (f) {
        val = val[f]
      })
      console.log(val)
    })
  }
})