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  1. or download this
    use IO::Handle;

...
print        "This is STDOUT\n";
print STDERR "This is STDERR\n";
warn         "This is a warning\n";
  2. or download this
    my $file = 'output.dat';

...
print        "This is STDOUT (2)\n";
print STDERR "This is STDERR (2)\n";
warn         "This is a warning (2)\n";
  3. or download this
    use v5.8.0;

...
print        "This is STDOUT (2)\n";
print STDERR "This is STDERR (2)\n";
warn         "This is a warning (2)\n";