I have a CLI application that uses commander.js and defines two commands, foo and bar. Since I am using git-style commands, basically my main file looks like this:

program
  .command('foo', 'does something')
  .command('bar', 'does something else')
  .parse(process.argv);

if (process.argv.length === 2) {
  program.help();
}

This works if I call my app without any arguments (then the help is shown, as intended), and it works if I call it with foo or bar as commands.

What does not work is if I specify a non-existing command. In this case, simply nothing happens at all:

$ myapp baz

How can I catch this case? I read that you may use

program.on('*', function () {
  // ...
});

and basically this works, but this executes not only for unknown commands, but for any command. In the same way, specifying a wildcard command does not work either: If I add

program.command('*').action(function () { ... });

this catches unknown commands (which is exactly what I want), but now if you run the app with --help it lists a * command (which is obviously not what I want).

So, to cut a long story short: How do I deal correctly with unknown commands?