How do you spell have a good one in french?

There isn't a direct translation for "have a good one" in French. However, here are some options depending on the context:

Formal:

* Bonne journée! (Good day!)

* Bonne soirée! (Good evening!)

* Passez une bonne journée/soirée! (Have a good day/evening!)

Informal:

* Bonne journée/soirée! (Good day/evening!)

* Profite bien! (Enjoy yourself!)

* À plus tard! (See you later!)

* Salut! (Bye!)

The best option depends on the relationship you have with the person you are speaking to and the time of day.