OK I went ahead and created an account. Thanks for all the help so far, guys.

So when I use open3, I create a program (sniped straight from the recipe only with my find command): 

use IPC::Open3;
use IO::Select;

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

system("$cmd");

print "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@@@@@@@@@@@@@@@@@@@@@@@@@@@\n";

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

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

#print CMD_IN "This line has a vt33 lurking in it\n";
close(CMD_IN);

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

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

[download]

In this command, there are several dozen lines of output, and two of them go to STDOUT; the rest go to STDERR. The output looks something like 

find: xxxxxxxx
..
/path/to/match1
find: xxxxxxxx
..
/path/to/match2
find: xxxxxxxx

[download]

however, running the program above, it simply hangs after the second line of output to STDOUT (the rest of STDERR is "left hanging?")

Edited by planetscape - added code tags

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

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