//
// program to sum integers from file, where filename is a command-line argument
//
if (args.length < 1) {
  println("need command-line argument (name of file)")
}
else {
  val source = scala.io.Source.fromFile(args(0))
  println("sum is " + 
    source.getLines.map(_.toInt).sum)
  source.close
}