There's no absolute truth. Sub commands are neat, options have less chance to clash with existing filenames but are more annoying to write. In any case you can handle `--` to stop the parameters and begin to handle anything that follows as filenames.

If you guide the user to setup nice aliases, this should not matter too much.

Perhaps replace `delete` with `destroy`. To me, that feels more deliberate, but again I spend a lot of time using terraform so maybe it's just me.