Move duplicate files to a directory

script.scala

import better.files._

def moveDupes(
  dir: File,
  logFile: File = (File.home / "dupes.txt"),
  dupeFolder: File = (File.home / 'dupes).createDirectory()
) = {
  for {
    log <- logFile.printWriter()
    (hash, toKeep :: toMove) <- dir.listRecursively.toSeq.groupBy(_.md5).mapValues(_.toList)
    _ = log.println(s"Hash=$hash has multiple files. Keeping $toKeep and moving $toMove")
  } toMove.foreach(_.moveToDirectory(dupeFolder))
}