what ideal update of portupgrade?

#!/usr/bin/perl

$nn = 0;

while (1) {

    $nn++;

    open( OPERN, "portversion |" );

    my @all2 = <OPERN>;

    close OPERN;

    my @all;

    for ( $i = 0 ; $i < @all2 ; $i++ ) {

        my ( $pp, $st ) = split( / /, $all2[$i], 2 );
        if ( $st =~ '<' ) {

            push @all, $pp;    # $all[$i] = $pp;

        }

    }

    exit if ( !$all[0] || $nn > 2 );

    while (1) {

        last if !$all[0];

        print "$all[0]\n";

        logsave( get_time(), $all[0] );

        system("portupgrade -rf $all[0]");  
      # system("portupgrade -Rf $all[0]");

      # First port to try to update the length and breadth
      # (Above the system need to comment)
      # if ($nn == 1) {
      #  system("portupgrade -rRf $all[0]");
      #  } else {
      #  system("portupgrade -rf $all[0]");
      #  }

   # Experimental:
   # You can add a script to automatically pressed the Enter
   #    use IO::Select;  
   #     my $select = IO::Select->new;
   #    for(@array) 
   #     open my $pipe, "|$_";
   #     $select->add($pipe);
   #    }
   #    my @waiters = $select->can_write($timeout);
   #    print $_ "\x0a" for @waiters; 


        logsave( get_time(), $all[0] );

        shift @all;

        my @all = old(@all);

    }

}

sub old {

    my @all = @_;

    open( OPEN2, "portversion |" );

    my @all_all = <OPEN2>;

    close OPEN2;

    my @old;
    my @no_old;

    foreach my $p (@all_all) {

        my ( $pname, $status ) = split( / /, $p, 2 );

        if ( $status =~ '<' ) {

            push @old, $pname;

        }
        else {
            push @no_old, $pname;
        }
    }

    my %seen;
    @seen{@all} = ();
    delete @seen{@no_old};
    return keys %seen;

}

sub get_time {
    my ( $sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst ) =
      localtime(time);
    $mon++;
    $year += 1900;
    if ( $mday < 10 ) { $mday = "0$mday"; }
    if ( $mon < 10 )  { $mon  = "0$mon"; }
    if ( $min < 10 )  { $min  = "0$min"; }
    my $date        = "$mday $mon $year";
    my $time        = "$hour:$min:$sec";
    my $cur_all_day = $mday + $mon * 30 + $year * 365;
    my $radate      = "$year-$mon-$mday $hour:$min:$sec";
    return $radate;
}


sub logsave {
    my ( $time, $ports ) = @_;
    my $logfile;
    $logfile = "\n time:  $time \n  ports: $ports \n\n";
    system("touch /var/log/portupgrade.log");
    open( DB2, "/var/log/portupgrade.log" ) || die "Cannot open file: $!";
    my @base = <DB2>;
    close(DB2);
    open( DB, ">/var/log/portupgrade.log" ) || die "Cannot open file : $!";
    print DB @base;
    print DB $logfile;
    close(DB);
}