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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Run terminal command with output in current buffer
Date: Fri, 16 Jul 2021 14:32:40 +0300
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> From: lisa-asket@perso.be
> Date: Fri, 16 Jul 2021 11:04:02 +0200 (CEST)
> 
> It guided we to this command.  I wonder how to call the command from my init file, have my own
> function for it.
> 
> (shell-command COMMAND &optional OUTPUT-BUFFER ERROR-BUFFER)
> 
> What shall I do with output-buffer ?

Did you read the doc string?  It answers your question quite
explicitly.