From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 21 Apr 2005 12:42:01 -1000
From: Tim Newsham <newsham@lava.net>
To: 9fans@cse.psu.edu
Message-ID: <Pine.BSI.4.61.0504211237520.26630@malasada.lava.net>
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Subject: [9fans] tip'o'day -- hack
Topicbox-Message-UUID: 3f7432c8-ead0-11e9-9d60-3106f5b1d025

This one's from Mike Haertel as described in:

   http://tinyurl.com/arnnd

Thanks for Andrey for pointing this out.  You can establish a two
way pipe to a command in /srv:

   $ cmd <[0=1] | echo 0 > /srv/name

and then access /srv/name to communicate with the command.  As
an example:

   $ mail <[0=1] | echo 0 > /srv/mailcons
   $ con -l /srv/mailcons
   ... connected to mail until ^\ quit ...
   $ con -l /srv/mailcons
   ... connected again ...

will let you detach and re-attach to the pipe to a long-lived
mail command.

Tim Newsham
http://www.lava.net/~newsham/