On a very simple level, open STDOUT for "some other data' and open STDERR for errors.
#!/usr/bin/perl
use strict;
use warnings;
use diagnostics;
open(STDOUT, '>', 'results.log') or die "Can't open log";
open(STDERR, '>', 'results_error.log') or die "Can't open log";
system("pmpath ExtUtils::MakeMaker");
system("pmpath Acme::AandB");
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