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From: Chuck Swiger <cswiger@mac.com>
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Date: Sun, 23 May 2010 10:15:30 -0700
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To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
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Cc: FreeBSD Ports <freebsd-ports@freebsd.org>
Subject: Re: Users and groups kept after a port deinstallation
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Hi--

On May 22, 2010, at 10:59 PM, Matthew Seaman wrote:
> OpenBSD has a convention that all system user accounts start with a '_'
> character.  There are a few accounts in UIDs that have adopted that, but
> no great stampede to adopt the idea despite most people agreeing with it.

That convention is being adopted by MacOS 10.6, also.  It does make it easier for one to separate out processes invoked by a human from automated tasks in ps or top...

Regards,
-- 
-Chuck