Scalaで手っ取り早くHelloWorld ref: http://qiita.com/544/items/2a8f4263a96cb11c46db

file1.txt

[masato] $ scala HelloWorldApp.scala Hoge
Hello Hoge

HelloWorldApp.scala

object HelloWorldApp extends App {
  val name:String = if (args.length > 0) args(0) else "World";
  println ("Hello %s".format(name))
}

HelloWorldApp.main(args)