subprocess confusion

[Tim Arnold]

"Nick Craig-Wood" <nick at craig-wood.com> wrote in message 
news:slrnf29k6m.c97.nick at irishsea.home.craig-wood.com...
> Tim Arnold <tiarno at sas.com> wrote:
<snip>
>>  Should I just put the remsh in the actual command instead of
>>  preexec_fn?
>
> Yes.
>
> The preexec_fn is run after the fork() but before the exec().  Ie a
> new process has been made, but it hasn't started your task yet.
>
> For example a classic use of preexec_fn is
>
>  preexec_fn=os.setsid
>
> You seem to be thinking it is pre-pending something to your command
> line which isn't how it works.
>
> -- 
> Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick

Thanks much to you and Michael H. for the great explanations.
Now everything is working fine, and I understand subprocess a little better!

--Tim Arnold