[SunHELP] double IO redirection

[Big Endian]

>On Fri, Jan 26, 2001 at 11:15:58AM -0500, Big Endian wrote:
>>  Is it possible in bash or the Bourne shell to redirect the standard
>>  output of a child process into its standard input while redirecting
>>  bash's output into the child's input?  Am I insane or is it possible?
>
>Your question is odd.  Both your shell and the program your shell forks
>and execs use your tty/pty as stdin/stdout/stderr . . . so what are you
>trying to accomplish?  Describe the situation.
>
>Regards,
>
>Nick Dronen

If you do a ps -ef|grep 'foo'|grep -v 'grep' you redirect the stdout 
of ps into the first grep's stdin which redirects it's stdout into 
the second grep's stdin.  This is pretty standard stuff, however I 
want to be able to execute a subshell in which the subshell and a 
second process have their I/O redirected to eachother.  For instance 
I want to execute a subshell and have its stdout goto a telnet 
process's stdin and the telnet's stdout goto the subshell's stdin.

I'm just wondering how to do this in a shell script if it is possible at all.