From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
Subject: Re: [9fans] v8 shell
In-Reply-To: Your message of "Sun, 16 Nov 2003 11:45:35."
             <2cd42c087fdb421f50167b5b1bc9d4dc@hamnavoe.com>
From: "Russ Cox" <rsc@swtch.com>
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Date: Sun, 16 Nov 2003 09:23:31 -0500
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> > 	tar c . | tee >{wc -c} | @{cd somewhere; tar x}
>
> Wow - I use <{cmd} a lot but I had never realised that >{cmd} works too.
>
> What I do miss in rc (does any other shell do it?) is the ability to
> open a read-write connection to a file.  For example you could test
> webcookies(4) by doing something like:
>
> <>[4]/mnt/webcookies/http { echo http://www.foo.baz >[1=4]; cat <[0=4] }
>
> Because the webcookies protocol requires that you write the url and read back
> the cookies on the same file descriptor, I can't see any way to do this in
> the existing shell.

i put this in byron's rc once but didn't bother
trying to convince anyone it was actually
useful on unix (especially since some more
magic was required to open unix domain
sockets transparently).

for lockstep protocols (one write, one read, ...)
you can use aux/rdwr.

	echo plan9.bell-labs.com mx | aux/rdwr /net/dns

there should be an option to silence the "> " prompts.