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  1. or download this
    $ perl -le'/std/i && print for keys %::'
stderr
...
$ perl -le'print stdout "Hello" or die $!'
Hello
  2. or download this
    $ perl -Mwarnings -Mstrict -le'print {*stdout} "Hello" or die $!'
Hello
$ perl -Mwarnings -Mstrict -le'print {\*stdout} "Hello" or die $!'
Hello