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From: alexis@reed.UUCP (Alexis Dimitriadis)
Newsgroups: net.unix
Subject: Re: Shell output directed to program (HELP)
Message-ID: <1551@reed.UUCP>
Date: Mon, 20-May-85 20:59:03 EDT
Article-I.D.: reed.1551
Posted: Mon May 20 20:59:03 1985
Date-Received: Wed, 22-May-85 02:06:38 EDT
References: <426@ihu1m.UUCP> <10756@brl-tgr.ARPA>
Reply-To: alexis@reed.UUCP (Alexis Dimitriadis)
Distribution: net
Organization: Reed College, Portland, Oregon
Lines: 28

> > ... I need to know if there is a way
> > to pass strings input to this program to the shell
> > for execution (such as pwd or cd etc.) and have
> > the resulting output from the shell directed back
> > to the program ...
> 
> Sure, but you have to be careful.  Trying to attach pipes
> for both input & output from the subshell is too hard,
> since the possibility of deadlock exists.  [...]


  Also, this will break may programs that modify their behavior when their
input or output is/is not a terminal.  (e.g. csh, ls, more, etc.).
  If your system has ptys, (pseudo-ttys) you should use them. They appear
as /dev/pty* if you have them.
 

-- 
_______________________________________________
  As soon as I get a full time job, the opinions expressed above
will attach themselves to my employer, who will never be rid of
them again.

             alexis @ reed

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