BEGIN {
    if ($^O =~ /^(MS)?Win/) {
        eval "use Win32::DriveInfo";
        die $@ if $@;
    }
}

##</code><code>##

if ( $^O =~ /^(MS)?Win/ )
{
    eval "use Win32::DriveInfo";

    $TotalNumberOfFreeBytes = (Win32::DriveInfo::DriveSpace('c:'))[6];
    $TotalNumberOfBytes = (Win32::DriveInfo::DriveSpace('c:'))[5];

    print "This is $^O \n";
    print "Total Free: $TotalNumberOfFreeBytes\tTotal size: $TotalNumberOfBytes\n";
    print $@,"\ndone!";
}
elsif ( $^O =~ /^linux/ )
{
    print "This is Linux OS!!!\n";
}