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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Suspend an external process (compilation/grep) from within Emacs
Date: Fri, 18 Jan 2008 18:31:28 +0200
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> From: Peter Dyballa <Peter_Dyballa@Web.DE>
> Date: Thu, 17 Jan 2008 13:16:25 +0100
> Cc: help-gnu-emacs@gnu.org
> 
> 
> Am 17.01.2008 um 10:30 schrieb Nordlöw:
> 
> > How do I temporarily suspend/stop an external process (compilation/
> > grep) from within Emacs and later continue it?
> 
> kill -STOP <GNU Emacs PID>
> kill -CONT <GNU Emacs PID>

I think the OP wanted to suspend/resume a process run by Emacs, not
Emacs itself.

To Nordlöw: look up the functions `stop-process', `continue-process',
and `signal-process'.