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Re: Removing duplicated lines

From: Jambunathan K
Subject: Re: Removing duplicated lines
Date: Thu, 29 Nov 2012 17:42:25 +0530
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

Dani Moncayo <> writes:

> Hi,
> Does (vanilla) Emacs have some command for removing duplicated lines
> in a given region?
> This is a command I'm missing for some time.
> I've done a quick search, but didn't found anything.
> If there isn't such command, I think I'd file a feature request.

Something like this ...

    (defun delete-duplicate-lines (beg end)
      (interactive "r")
      (let ((lines (split-string (buffer-substring beg end) "\n")))
        (delete-region beg end)
         (mapconcat #'identity (delete-dups lines) "\n"))))

> TIA.


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