Kloogy solution: 
use IPC::Open3;
use IO::Select;

$cmd="find /fst/home/ -name '*ooo*'";

$pid = open3(*CMD_IN, *CMD_OUT, *CMD_ERR, $cmd);
close(CMD_IN);

$SIG{CHLD} = sub {
    print "REAPER: status $? on $pid\n" if waitpid($pid, 0) > 0
};

$selector = IO::Select->new();
$selector->add(*CMD_ERR, *CMD_OUT);

while (@ready = $selector->can_read) {
    foreach $fh (@ready) {
    $line = scalar <$fh>;
    if (fileno($fh) == fileno(CMD_ERR)) {print "STDERR: ", $line}
    else {print "STDOUT: ", $line}
    ($line) || $selector->remove($fh);
    }
}

close(CMD_OUT);
close(CMD_ERR);

[download]

In reply to Re^2: Prepending a string to STDERR output, and logging STDOUT & STDERR synchronously to a file by OfficeLinebacker
in thread Prepending a string to STDERR output, and logging STDOUT & STDERR synchronously to a file by Anonymous Monk

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