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I have dired and dired+ setup for viewing directory listings and use it as my file-manager for moving / copying files. Currently dired lists '0' as the size for all the subdirectories in any directory.

I would like to have dired calculate and display folder sizes. I would like this to be bound to a keystroke/mouse-click since I don't want dired to do this on every folder in every buffer.

As of now, I have "open in explorer" (w32-shell-execute in windows and gnome-open in gnome) bound to "O" from which I use Alt+Enter to calculate the subdirectory size.

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up vote 2 down vote accepted

This Emacs wiki page suggests using the following snippet to calculate the size of selected files and directories:

 (defun dired-get-size ()
  (let ((files (dired-get-marked-files)))
      (apply 'call-process "/usr/bin/du" nil t nil "-sch" files)
      (message "Size of all marked files: %s"
                 (re-search-backward "\\(^[0-9.,]+[A-Za-z]+\\).*total$")
                  (match-string 1))))))

 (define-key dired-mode-map (kbd "?") 'dired-get-size)

If I understand you correctly, you'd like to update value the Dired buffer directly. I'm not familiar enough with Dired's internals, but I guess it's shouldn't that hard.

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I am ok if updating the dired buffer is not possible. I read also in the emacs wiki ( - jump to very end of page) that it is difficult to do so. However, I'd like a solution that would work in Linux as well as Windows. In fact, I primarily dired in Windows to escape from explorer. Is there 'du' for windows ? – koushik Aug 16 '12 at 18:48
I found out that I can get 'du' working in windows (cygwin or git - that works for me). Thanks for the solution ! It'd be nice if I can somehow get this info to persist in the dired buffer... – koushik Aug 16 '12 at 19:02

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