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pipe for stderr and stdout
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Subject Author Date
pipe for stderr and stdout Ivan Novick 03-26-2008
Posted by Ivan Novick on March 26, 2008, 7:17 pm
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 Hi,

From within perl i want to start a first process 'A' which writes to
both STDOUT and STDERR.

From the same perl script i want to start 2 more processes.

One, 'B', that reads from STDOUT of 'A"

The other, 'C', that reads from STDERR 'A'

Is this possible from within perl?

Thanks,
Ivan Novick
http://www.myperlquiz.com/

Posted by Gunnar Hjalmarsson on March 26, 2008, 8:33 pm
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 Ivan Novick wrote:
> From within perl i want to start a first process 'A' which writes to
> both STDOUT and STDERR.
>
> From the same perl script i want to start 2 more processes.
>
> One, 'B', that reads from STDOUT of 'A"
>
> The other, 'C', that reads from STDERR 'A'
>
> Is this possible from within perl?

Yes.

--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl

Posted by Ivan Novick on March 26, 2008, 10:28 pm
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> Ivan Novick wrote:
> > From within perl i want to start a first process 'A' which writes to
> > both STDOUT and STDERR.
>
> > From the same perl script i want to start 2 more processes.
>
> > One, 'B', that reads from STDOUT of 'A"
>
> > The other, 'C', that reads from STDERR 'A'
>
> > Is this possible from within perl?
>
> Yes.
>
> --
> Gunnar Hjalmarsson
> Email:http://www.gunnar.cc/cgi-bin/contact.pl

How about a hint as to how?

Ivan Novick
http://www.myperlquiz.com/

Posted by Gunnar Hjalmarsson on March 26, 2008, 11:49 pm
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Ivan Novick wrote:
>> Ivan Novick wrote:
>>> From within perl i want to start a first process 'A' which writes to
>>> both STDOUT and STDERR.
>>> From the same perl script i want to start 2 more processes.
>>> One, 'B', that reads from STDOUT of 'A"
>>> The other, 'C', that reads from STDERR 'A'
>>> Is this possible from within perl?
>>
>> Yes.
>
> How about a hint as to how?

I'm not able to tell you any details, but I'd study "perldoc perlipc"
and "perldoc perlfork" and start playing with code.

--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl

Posted by Ted Zlatanov on March 27, 2008, 10:16 am
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IN> From within perl i want to start a first process 'A' which writes to
IN> both STDOUT and STDERR.

IN> From the same perl script i want to start 2 more processes.

IN> One, 'B', that reads from STDOUT of 'A"

IN> The other, 'C', that reads from STDERR 'A'

IN> Is this possible from within perl?

I believe it's possible with IPC::Run, which has pretty much every way
of running a program and capturing its output I ever needed. I can't
give you the exact solution but you'll see very relevant examples in the
first pages of the module's documentation (especially feeding one
child's output to another). You can install IPC::Run from CPAN.

Ted

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