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From: arnold@skeeve.com (Aharon Robbins)
Newsgroups: gnu.bash.bug
Subject: Re: foo | tee /dev/stderr | bar # << thanks!
Date: Mon, 6 Jul 2020 19:21:56 +0000 (UTC)
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In article <mailman.1050.1594038644.2574.bug-bash@gnu.org>,
Greg Wooledge  <wooledg@eeg.ccf.org> wrote:
>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.
>

Say rather, not in all commercial Unixes. Solaris for sure has it.
I think AIX does too, but don't remember for sure.