send tmux command from inside ssh session

Question

Inside tmux we ssh to a server that doesn't run tmux

local>tmux send-key C-p  # works
local>ssh user@remote
user@remote> tmux send-key C-p
tmux: command not found

It looks like this more of ssh question.

Answer 1

tmux isn't installed on the remote system. Install it.

Answer 2

To communicate with bash, tmux session uses 'unix socket'. That's why installing tmux on remote machine won't help.

What will work is reverse-ssh to your local machine and execute tmux command like:

user@remote> ssh user@local 'tmux send-key C-p'