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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Any way to remove ^L or ^M from some buffer outputs?
Date: Mon, 05 Oct 2020 21:23:50 +0300
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> Date: Mon, 05 Oct 2020 21:21:57 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> If this text comes from the shell, you can make Emacs eliminate the ^M
> characters by setting the read part of process-coding-system to *-dos.

Or maybe *-mac, if the ^M characters appear alone, not before a
newline.