Hi, I am new to open3 and perldoc is too vague to understand
I am trying a simple unix command to run in open3.
open3($stdin, $stdout, $stderr, "gcp -vpfR $xrc $dst")


What i need is -- I want to caputre STDOUT until gcp finishes or there is something on STDERR (on disk full case etc).

while (<$stdout>) {
print "$_";
}
@stderr = <$stderr>;
if (@stderr) { dir "ERROR: gcp\n" }


BUT this is not working -- any suggestions