def main (args : Array[String]) {
    // Convert the "args" Array to a List.
    val argsList : List[String] = args.toList
    // Get all but the last element as a new List "sources".
    val sources : List[String] = argsList.init
    // Get the last element as a String "target".
    val target : String = argsList.last
    concatFiles (sources, target)
    println("main()")
  }