"...provide a code snipit..."

Sorry, no. Not in a hurry. I didn't use IPC::Run like this. But haukex gave already some advice. And you are aware that the code you provided at Re^4: Capture STDOUT and send to screen with open3 (updated) doesn't compile?

Best regards, Karl

I am sorry, I am trying it and it hangs. Here is what I am executing: What am I doing wrong? Also, will this print a line real time from cat as if output were not being captured?

my @cat = qw( cat );
run \@cat,
        '<pipe', \*PIPE,
        '>', new_chunker("\n"), sub {
                my $line = shift;
                print $line;
                push @out, $line;
        }, '2>', new_chunker("\n"), sub {
                my $line = shift;
                print STDERR $line;
                push @err, $line;
        } or die $?;
print PIPE "some input\n";
close PIPE;
print "out @out";
print "err @err";
[download]

IPC::Run's run basically runs a command to completion, if you want interactive communication with the subprocess, as your code example appears to be showing, you'll want its start/pump/finish interface. The module's documentation is a bit long, but it is a powerful module, so I recommend reading up on it. Also, a more detailed description of what this subprocess is and what you want to communicate to it would be helpful.

Otherwise, if all you want to do is send a single string to its STDIN, then I think you should just be able to do run \@cmd, '<', \$data, ....