 
   ## Examples
 
-      File.rm_rf "samples"
+      File.rm_rf("samples")
       #=> {:ok, ["samples", "samples/1.txt"]}
 
-      File.rm_rf "unknown"
+      File.rm_rf("unknown")
       #=> {:ok, []}
 
   """

      File.dir?("~/Downloads")
      #=> false

      "~/Downloads" |> Path.expand |> File.dir?
      #=> true

  """


  ## Examples

      File.open("file.txt", [:read, :write], fn file ->
        IO.read(file, :line)
      end)

