if( ! $ENV{PDUPRE_RESTART}) {
        $ENV{PDUPRE_RESTART} = 1;
        print "Restarting as '$0, @ARGV'\n";
        ...
        exec $0, @ARGV
            or print "Exec error when restarting $0 @ARGV: $!";
        exit 1;
    };

##</code><code>##

    if( ! grep { /^--restarted$/ @ARGV) {
        print "Restarting as '$0 --restarted @ARGV'\n";
        exec $0, '--restarted', @ARGV
            or print "Exec error when restarting $0 @ARGV: $!";
        exit 1;
    };