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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix
Subject: Re: Shell output directed to program (HELP)
Message-ID: <10756@brl-tgr.ARPA>
Date: Thu, 16-May-85 22:41:35 EDT
Article-I.D.: brl-tgr.10756
Posted: Thu May 16 22:41:35 1985
Date-Received: Sun, 19-May-85 04:26:30 EDT
References: <426@ihu1m.UUCP>
Distribution: net
Organization: Ballistic Research Lab
Lines: 13

> ... 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.  Put input for
the subshell into a file, then invoke the popen() library
function to run "shellname <filename" in "r" mode,
followed by invocations of getc() to read the output
returned from the shell.