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Date: Sun, 27 Oct 2013 17:46:45 +0000
From: Peter Stephenson <p.w.stephenson@ntlworld.com>
To: Zsh Hackers' List <zsh-workers@zsh.org>
Subject: Re: multios doesn't work with 2>&1
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	<131027100137.ZM4100@torch.brasslantern.com>
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Bart Schaefer wrote:
> If I back out workers/20666 (Jan 2005), then this example works again.

(This is really a zsh-workers thing, too, so I've moved it.)

Crikey, I'd worked out it was already broken in 2007 and I thought I was
doing well...

Playing around here, the other observation I have before looking at the
thread you're talking about is that

echo foo 2>&1 >/dev/null > >(sed 's/foo/bar/')
echo foo >/dev/null 2>&1 > >(sed 's/foo/bar/')
echo foo >/dev/null > >(sed 's/foo/bar/') 2>&1

all work as expected.  This seems inconsistent --- the synchronous /
asynchronous and run-in-shell / fork behaviour is clearly different in
that case, but it's not clear that should affect redirection.

(I'd also worked out that

echo foo >/dev/null 2>&1 | sed 's/foo/bar/'

gives a different bad effect, namely you get the output you want but the
shell hangs, but that maybe another natural consequence of the thread I
haven't read yet.)

pws