DouKaku?

import scala.io._
import java.net._
import scala.collection.mutable._
import scala.util.matching._
object M extends Application{
    Source.fromURL(new URL("http://www.gnu.org/licenses/gpl.txt")).getLines.toList.zipWithIndex.foldLeft(new HashMap[String,List[Int]]){(h,d) =>
        (new Regex("\\w+")).findAllIn(d._1).foreach{w=>if(h.isDefinedAt(w))h.update(w,h.apply(w)+(d._2+1))else h.update(w,List(d._2+1))};h
    }.elements.toList.sort{(a,b)=>a._1<b._1}.foreach{e=>
        printf("%s\t%s\n",e._1,e._2.tail.foldLeft(e._2.head.toString){(j,i)=>j+","+i.toString})
    }
}