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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: How to disable auto save on Emacs 26.1
Date: Thu, 04 Oct 2018 09:10:27 -0400
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> The files with the tilde at the end are (typically) backup files.

Indeed.

> They are supposed to survive the session and give you a "previous
> state" to fall back to should your session do a catastrophic thing.

No, they're not meant to handle crashes but rather pilot errors
(they're supposed to hold the state of the file before the last time you
edited it with Emacs).

> The "auto save" file name would rather look like ".#Makefile", and the

No, the .#foo "files" are the symlinks used as "lock files" to indicate
that the file is being edited by an Emacs session (can be disabled by
setting `create-lockfiles`).

The autosave files have names of the form #foo#


        Stefan