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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Sun, 15 Apr 2018 10:38:07 -0700
Message-ID: <CAH+w=7ZVx_uJQkJgSn-4wdyfRece6AADPWb+S=F1q2oJWai67w@mail.gmail.com>
Subject: Re: "echo | ps -j $(:) | cat | cat | cat" runs components in
 different process groups
To: Peter Stephenson <p.stephenson@samsung.com>, Zsh hackers list <zsh-workers@zsh.org>
Content-Type: multipart/alternative; boundary="00000000000079bab00569e69146"

--00000000000079bab00569e69146
Content-Type: text/plain; charset="UTF-8"

On Sun, Apr 15, 2018 at 9:23 AM, Stephane Chazelas <
stephane.chazelas@gmail.com> wrote:

>
> Also note that
>
> echo $(sleep 10) & echo started
>
> Only outputs "started" after 10 seconds.
>

I would say that's actually correct.  $(sleep 10) is *not* a background
job, it's output has to be collected before the first "echo" can run.  The
shell has no intrinsic idea that there won't be any output.

--00000000000079bab00569e69146--