How do I reattach to a detached mosh session or otherwise get rid of
Mosh: You have a detached Mosh session on this server (mosh [XXXX]).
i.e. what's the mosh equivalent of
screen -D -R
or possibly
screen -wipe
Furthermore, where can this answer be found in documentation?
For security reasons, you can not reattach, see https://github.com/keithw/mosh/issues/394
To kill the detached session, use the PID number displayed in that message (that's the 'XXXX' part.) For example, if you see --
Mosh: You have a detached Mosh session on this server (mosh [12345]).
And can run this command:
kill 12345
Also, to close all mosh connections you can:
kill `pidof mosh-server`
Note that if you are currently connected via mosh, this last command will also disconnect you.