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From: Jeremy on 22 Apr 2010 13:43
Hi,

From the shell, I want to allocate a new pseudoterminal using a named
pipe for its stdin and stdout. Is this possible? I've looked for a
program that will do this, but I'm coming up short. screen will not do
exactly what I want, from what I can tell.

My end goal is that I have several ptys open, and I'm getting labeled
output from each of them in my main terminal:

~$ mkfifo mypipe1
~$ mkfifo mypipe2
~$ # the following would create the pty using mypipe1 for I/O
~$ some_magic_command mypipe1
~$ some_magic_command mypipe2
~$ # the following sends input to the pty to execute a command there
~$ echo 'someprogramwithoutput
> ' >> mypipe1
~$
~$ echo 'someprogramwithoutput
> ' >> mypipe2
~$ # the following will monitor both pipes and give labeled output
~$ tail -f mypipe1 -f mypipe2
==> mypipe1 <==
some output from mypipe1's pty

==> mypipe2 <==
some output from mypipe2's pty
some more output from mypipe2's pty

==> mypipe1 <==
some more output from mypipe1's pty


And so forth. Is there a utility that will allow me to do this? Can
the 'some_magic_command' be filled in with a real command?

Thanks,
Jeremy
From: Jeremy on 22 Apr 2010 13:49
On 4/22/2010 10:43 AM, Jeremy wrote:
> <snip>
> ~$ mkfifo mypipe1
> ~$ mkfifo mypipe2
> <snip>

Correction: I just realized I would probably need two pipes for each pty
(one for stdin and one for stdout).

From: Sidney Lambe on 22 Apr 2010 15:12
On comp.unix.shell, Jeremy <jeremy(a)pinacol.com> wrote:
> Hi,
>
> From the shell, I want to allocate a new pseudoterminal using a named
> pipe for its stdin and stdout. Is this possible? I've looked for a
> program that will do this, but I'm coming up short. screen will not do
> exactly what I want, from what I can tell.
>
> My end goal is that I have several ptys open, and I'm getting labeled
> output from each of them in my main terminal:
>
> ~$ mkfifo mypipe1
> ~$ mkfifo mypipe2
> ~$ # the following would create the pty using mypipe1 for I/O
> ~$ some_magic_command mypipe1
> ~$ some_magic_command mypipe2
> ~$ # the following sends input to the pty to execute a command there
> ~$ echo 'someprogramwithoutput
> > ' >> mypipe1
> ~$
> ~$ echo 'someprogramwithoutput
> > ' >> mypipe2
> ~$ # the following will monitor both pipes and give labeled output
> ~$ tail -f mypipe1 -f mypipe2
>==> mypipe1 <==
> some output from mypipe1's pty
>
>==> mypipe2 <==
> some output from mypipe2's pty
> some more output from mypipe2's pty
>
>==> mypipe1 <==
> some more output from mypipe1's pty
>
>
> And so forth. Is there a utility that will allow me to do this? Can
> the 'some_magic_command' be filled in with a real command?
>
> Thanks,
> Jeremy

I don't believe you can do that, nor is it necessary. What you _can_
do is create a new pty that runs a command/script when created, or
you can direct the output of commands/scripts to an existing pty:

ls -l > /dev/pts/4

echo -e "\n\n`ls -l`" > /dev/pts/4

Sid

From: Jonathan de Boyne Pollard on 23 Apr 2010 02:13
>
>
> From the shell, I want to allocate a new pseudoterminal using a named
> pipe for its stdin and stdout. Is this possible?
>
Yes. One set of tools that have been around for years for this are the
tools in the ptyget package.

http://code.dogmap.org/ptyget/


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