gistfile1.scala

import com.quantifind.sumac.{FieldArgs, ArgMain}
class RangeArgs extends FieldArgs {
    var from: Int = 0
    var to: Option[Int] = None
    @FileExists
    var file: File = _
}
class FileRange extends ArgMain[RangeArgs] {
    def main(args: RangeArgs) {
      val lines = scala.io.Source.fromFile(args.file).getLines
                                 .drop(args.from)
      args.to.map(to => lines.take(to)).getOrElse(lines)
              .foreach(println)
     }
}