When I try who, I frequently see output such as this:username  pts/0        2015-10-09 04:48 (mosh [2680])username  pts/2        2015-10-12 00:04 (75.139.11.119 via mosh [12364])username  pts/6        2015-10-12 00:10 (75.139.11.119 via mosh [9728])Where my username is logged into several sessions. Unfortunately I do not know which one I am currently using. Is there a way to tell so that if I kill the mosh PID, I don't kill my own session?
How do I know which Mosh Client I am?
ssh;kill;mosh
The tty command will tell you which pseudo-terminal session you are running. And that can distinguish which line is yours. 