hello.out

% ./hello.p6
Usage:
  ./hello.p6 [--language=<str>] <name>
  
% ./hello.p6 --language=french Donald
Bonjour Donald!

hello.p6

use v6;

sub MAIN($name, str :$language = 'english') {
  given $language {
    when 'english' {
      say "Hello {$name}!"
    }
    when 'french' {
      say "Bonjour {$name}!"
    }
  }
}