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  1. or download this
    local *STDOUT = new IO::Tee(\*STDOUT, '>file.txt');
  2. or download this
    open STDOUT, '>&', new IO::Tee(\*STDOUT, '>file.txt');
  3. or download this
    # Append
open STDOUT, '>>&', new IO::Tee(\*STDOUT, '>file.txt');
...
# Save the extra file descriptor
open STDOUT, '>&=', new IO::Tee(\*STDOUT, '>file.txt');
open STDOUT, '>>&=', new IO::Tee(\*STDOUT, '>file.txt');