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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 08:30:39 -0400
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On Mon, Jul 06, 2020 at 03:03:15PM +0300, Ilkka Virta wrote:
> On 6.7. 14:37, Greg Wooledge wrote:
> > On Sat, Jul 04, 2020 at 01:42:00PM -0500, bug-bash@trodman.com wrote:
> > > but your soln is simplier.  I assume /dev/stderr is on non linux UNIX
> > > also.
> > 
> > It is *not*.  It is not portable at all.
> 
> It works on macOS and I see mentions of it in man pages of the various
> *BSD:s and Solaris, so even if not standard, it's not like it's Linux-only.

Yes, it's present in Linuxes and (most?) BSDs.  But not in commercial
Unixes.