Sending input to all tmux panes
If you need to enter the same input into two tmux panes (useful if running the same command on multiple servers) do the following:
ctrl-b : then enter setw synchronize-panes on
Run ctrl-b : then enter setw synchronize-panes off to disable it
References:
https://medium.com/@bingorabbit/tmux-propagate-to-all-panes-9d2bfb969f01