From Copenhagen to Christiania (Oslo) in 1869

Hello group - wondering if anyone might know how an emigrant would get from Copenhagen to Christiania in 1869. Was there regularly scheduled service on a small steamship? Ferry service? Type (and name) of ship? Researching for a book and trying to nail down this final detail. Thanks for any and all help! PS jkmarler I saw your reply to another question I posted: THANK YOU!!!