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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