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From: Helmut Eller <eller.helmut@gmail.com>
Newsgroups: gmane.emacs.help
Subject: Re: copy-line
Date: Sun, 01 Feb 2009 09:41:55 +0100
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Thanks to everyone who replied.
Apparently Emacs has no standard command to do that.
I'll use the code below and bind it to C-x ,

Helmut.

(defun copy-line ()
  "Copy the current line."
  (interactive)
  (let ((col (current-column))
        (beg (progn (beginning-of-line) (point)))
        (end (progn (end-of-line) (point))))
    (forward-line)
    (save-excursion (insert (buffer-substring beg end) "\n"))
    (move-to-column col)))