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  1. or download this
    sub hello/world {
  say "Hello World";
}
  2. or download this
    *{'hello/world'} = sub {
    print shift, "\n";
};

&{'hello/world'}("Hello World!");
  3. or download this
    open *{'hello/world'}, '>', '/home/tai/tmp/helloworld.txt';
print {*{'hello/world'}} "Hello World!\n";