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Date: Wed, 27 Apr 2016 09:06:17 +0200
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Subject: Re: [9front] Compound commands and pipes in rc
From: Rudolf Sykora <rudolf.sykora@gmail.com>
To: 9front@9front.org
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Hello,

On 20 April 2016 at 15:15, Alex Musolino <musolinoa@gmail.com> wrote:
> Hi all,
>
> I have come across some suspect behaviour in rc. I have trawled the
> man page but it doesn't seem to have much to say on the matter.
>
> Consider the following rc script:
>
> bind '#|' /n/gopher
>>[3=1] {
>     echo
>     cat </n/gopher/data >[1=3]
> } | aux/trampoline tcp!gopherproject.org!70 >/n/gopher/data1
>
> This produces no output, whilst the following script does:
>
> bind '#|' /n/gopher
>>[3=1] {
>     echo
>     cat </n/gopher/data >[1=3]
>     echo >/dev/null
> } | aux/trampoline tcp!gopherproject.org!70 >/n/gopher/data1
>
> It would seem that in the first example the unnamed pipe is closed
> after echo exits and therefore before aux/trampoline can read anything
> from the remote end much less write anything to the named pipe.
>
> Can someone confirm whether or not this is the case and, if so,
> whether or not it is expected behaviour?

I don't really understand your question, but would recommend
you to ask in the plan9 mailing list; people there might know better.
Ruda