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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: c library for handling backup files?
Date: Wed, 21 Sep 2022 16:15:48 +0300
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> From: "Alfred M. Szmidt" <ams@gnu.org>
> Date: Wed, 21 Sep 2022 08:34:35 -0400
> 
> Does anyone know of a C library for handling Emacs-like backup files?
> E.g., if writing a file, the function would do the right thing.

Coreutils do that, no?  E.g., "cp -b".

> And all the other nice things that come with Emacs.

_All_ of them?  That's Emacs, I guess.