The Shell Access wiki page started to get a bit unwieldy, and it contained extra information that would be going away after the transition. So, I've created a Shell Access 2018 Transition page to house information specific to the transition.
Again, please post here any public feedback or queries, so that other readers can gain the benefit of the answers. For private items, such as those pertaining to security, please email firstname.lastname@example.org .
We're thinking of trying for March 15th as a time to start restricting access to the old shell server. However, that is somewhat flexible, as we don't want to leave anyone behind.