[PD] Control external command from Pd

[Roman Haefeli]

On Thu, 2016-12-01 at 11:09 +0100, Jack wrote:
> Hello Roman,
> 
> Did you try :
> 
> [command & echo $!(
> > 
> > 
> [shell]
> 
> It will return the pid of 'command'.

Yes, you're right: It's not even necessary to put that into an extra
script (I thought I had to because of the dollar sign).

However, the problem remains: When I send 'command' to background,
[shell] won't output its stdout to the left outlet anymore.

Roman


> Le 01/12/2016 à 10:52, Roman Haefeli a écrit :
> > 
> > Hey all
> > 
> > I would like to use Pd to start and stop several instances of a
> > certain
> > command. I need to catch the stdout of the commands in Pd, so I can
> > monitor their status. Also, I want to be able to kill them
> > individually.
> > 
> > I tried to achieve that with [ggee/shell], but there are some
> > culprits. 
> > 
> > When I launch the command directly in [shell] like this:
> > 
> > [command (
> > > 
> > > 
> > [shell]
> > 
> > I get the command's stdout on the left outlet of [shell], but I
> > don't
> > know of a reliable way to send a SIGHUP signal to command.
> > 
> > On the other, I can launch a wrapper script that sends command to
> > the
> > background and returns its PID:
> > 
> > #!/bin/sh
> > command & 
> > echo $!
> > 
> > and in Pd, I do:
> > 
> > [./wrapper.sh (
> > > 
> > > 
> > [shell]
> > 
> > and the left outlet of [shell] gives me the PID of the command
> > which
> > allows me to reliably kill that instance later. However, this way
> > [shell] doesn't output the command's stdout. 
> > 
> > Is there a way to have my cake and eat it, too?
> > 
> > Roman
> > 
> > 
> > 
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> 
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