randfile() {
  number="$1"
  shift
  for dir
  do
    files=("$dir"/*)
    for ((i=0; i<number && ${#files} > 0; i++))
    do
      (( idx = RANDOM % ${#files[@]} ))
      echo "${files[idx]}"
      unset files[idx]
      files=("${files[@]}")
    done
  done
}