#!/usr/bin/perl
use warnings;
use strict;
use IPC::Open3;

my $pid = open3(\*WRITE, \*READ,0,"/usr/bin/cdrecord -v -dummy -eject /mnt/my.iso");
            #if \*ERROR is false, STDERR is sent to STDOUT  

#while(1){ 

#select(undef,undef,undef,.01); 

chomp(my $output = <READ>);
print "$output\n";

#do some split and test to extract percentage 

#} 

waitpid($pid, 1);
# It is important to waitpid on your child process,   
# otherwise zombies could be created.