rtmux -version (return code: 0)
Agent pid 13108
Bad escape character 'rsion'.
rtmux --help (return code: 0)
Usage: rtmux [autossh or ssh options] <host>
If $RSCREEN_COMMAND is set (either in the environment, in
/etc/rtmuxrc, or in ~/.rtmuxrc), it will be used instead of screen
or tmux. Use this feature if you want to supply additional screen
options or tmux commands. (Using $RTMUX_COMMAND does not work!)