gistfile1.scala

def withPrintWriter(files: String*)(op: Seq[PrintWriter] => Unit) {
  val writers = files.map(f => new PrintWriter(f))
  try op(writers)
  finally writers.foreach(_.close)
}

withPrintWriter("/col1.txt",
                "/col2.txt") { ws =>
  Source.stdin.getLines().map(_.split("\t")).foreach {
    case Array(col1, col2, _*) =>
      ws(0).println(col1)
      ws(1).println(col2)
    case Array(col1) => ws(0).println(col1)
  }
}