does perl execute in a subshell??

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This is a curious question coming to my mind. I am making perl programs o=
n Unix (korn shell) . Just wanted to know when these perl programs are ru=
n, do they execute on the same shell?? or do they execute in a subshell??
=20
This is a curious thing tht came to my mind.
=20
Regards,
Ukh

=20
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RE: does perl execute in a subshell??

From: activeperl-bounces@listserv.ActiveState.com
[mailto:activeperl-bounces@listserv.ActiveState.com] On Behalf Of ukhas
jean
Sent: 27 February 2007 07:02
To: Active Perl
Subject: does perl execute in a subshell??

> This is a curious question coming to my mind. I am making perl
programs on Unix (korn shell) . Just wanted to
> know when these perl programs are run, do they execute on the same
shell?? or do they execute in a subshell??

Neither, perl executes in a separate process from any shell that invokes
it.

HTH

-- =

Brian Raven =


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Re: does perl execute in a subshell??

ukhas jean wrote:
> This is a curious question coming to my mind. I am making perl programs
> on Unix (korn shell) . Just wanted to know when these perl programs are
> run, do they execute on the same shell?? or do they execute in a subshell??
>
> This is a curious thing tht came to my mind.

If you run a Perl script from the command line, I would assume it would
be run as a separate child process under the korn shell (I believe part
of the process group for that shell, but I've never used korn shell, so
I'm guessing it's pretty much the same as other shells).

If in the Perl script you were to run a 'system' call, backticks or similar
type calls, they would be run as child processes of the Perl script process.
You can obviously background the processes you start and disassociate them
from the creating process if that's expedient to your needs.

You can assign the processes to a process group (setpgid) if you need to
control them en masse.

You could read fork() and exec() man pages for the normal process creating
scenario on UNIX systems.

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