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  1. or download this
    modifyHash(\%my_hash);

...
  ${$hash_ref}{'test'} = 1;
  #$hash_ref->{'test'} = 1;   #alternative
}
  2. or download this
    %my_hash        -> %{$hash_ref}
keys(%my_hash)  -> keys(%{$hash_ref})
%my_hash = ();  -> %{$hash_ref} = ()
$my_hash{$key}  -> ${$hash_ref}{$key}