you can do he same from perl: 
my $pid = open STDOUT, '|-';
unless ($pid) {
  defined $pid or die "unable to fork new process: $!";
  open my $tee, '>>', $stdout_log_fn
    or die "unable to open '$stdout_log_fn'";
  select $tee; $| = 1;
  select STDOUT; $| = 1;
  while (<>) {
    print $tee "OUT $_";
    print $_;
  }
  exit(0);
}

# and repeat for STDERR

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In reply to Re^2: How to log all output from a program? by salva
in thread How to log all output from a program? by absolut.todd

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