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    if( ! $ENV{PDUPRE_RESTART}) {
        $ENV{PDUPRE_RESTART} = 1;
...
            or print "Exec error when restarting $0 @ARGV: $!";
        exit 1;
    };

    if( ! grep { /^--restarted$/ @ARGV) {
        print "Restarting as '$0 --restarted @ARGV'\n";
...
        exit 1;
    };