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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: foo | tee /dev/stderr | bar  # << thanks!
Date: Mon, 6 Jul 2020 07:37:32 -0400
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On Sat, Jul 04, 2020 at 01:42:00PM -0500, bug-bash@trodman.com wrote:
> On Fri 7/3/20 14:03 -0400 =?utf-8?Q?Lawrence_Vel=C3=A1zquez?= wrote:
> >What's wrong with `foo | tee /dev/stderr | bar`?
> 
> but your soln is simplier.  I assume /dev/stderr is on non linux UNIX
> also.

It is *not*.  It is not portable at all.