I've mostly stopped bothering with trying to deal with shell redirection and the portability issues it raises. Capture::Tiny abstracts the details away and lets me get on with my work. Here's the module's decription:
Capture::Tiny provides a simple, portable way to capture almost anything sent to STDOUT or STDERR, regardless of whether it comes from Perl, from XS code or from an external program. Optionally, output can be teed so that it is captured while being passed through to the original filehandles. Yes, it even works on Windows (usually). Stop guessing which of a dozen capturing modules to use in any particular situation and just use this one.
The capture_merged function should give you all the ammunition you need.
use strict;
use warnings;
use Capture::Tiny qw( capture_merged );
my $input = shift;
my $output = '/home/me/output.txt';
my $run = '/home/me/ipinfo.pl';
open my $infh, '<', $input or die $!;
open my $ofh, '>', $output or die $!;
while( <$infh> ) {
chomp;
my( $captured, @results )
= capture_merged { system $run, $_ };
print $ofh $captured;
}
close $ofh or die $!;
close $infh;
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