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copy-files, overwriting files, and random ideas

From: Alfred M. Szmidt
Subject: copy-files, overwriting files, and random ideas
Date: Tue, 23 Aug 2022 15:55:43 -0400

It would be really nice if when copying a file, and the destination
exists, that you could somehow get Emacs to copy the new file beside
the old one, and/or copy away the old one as a backup, and then
replace it.

It's specially useful if you copy multiple files in dired, since the
only option is to abort the whole thing.

Being able to diff the files would also be really really nice; if
text-files do something with diff-mode and if else, just a CRC, and
output from stat or similar.

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