Hmmm, I'd need to see the original run_parallel, I think.

Did you try using "2>&1"?

#!/usr/bin/perl -w

use strict;

my $x=`ls a.a 2>&1`;
print "dollar x is $x\n";
print "***************\n";
[download]

That captures the stderr output nicely.

But I'm not sure this trick will work with whatever underlies your run_parallel subroutine.

Could you post a pointer to the node where you found it?
--
Mike