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if ($pid=fork() ) {
    select(undef,undef,undef,.1);
        open (STDOUT, ">test.txt");
...
} else {
    print "child\n";
}

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if ($pid=fork() ) {
    #select(undef,undef,undef,.1);
    print "parent\n";
...
    open (STDOUT, ">test.txt");
    system("echo child");
}