mjhjmtu

How can I write the following in a bash script?

tmux # Start tmux session.
compass watch /path/to/project1/compass/ # Run the first process.
Ctrl + B, " # Split the pane.
compass watch /path/to/project2/compass/ # Run the second process.
Ctrl + B, D # Exit the session.

tmux 
 new-session 'compass watch /path/to/project1/compass/' ; 
 split-window 'compass watch /path/to/project2/compass/' ; 
 detach-client

The new-session command (which creates a new tmux session) and the split-window command (which splits the current window into two panes) in tmux takes optional shell commands to run. The detach-client does the obvious at the end.

When sending multiple tmux commands to tmux you need to separate them by ;. The ; needs to be protected from the shell by quoting/escaping it (';', ";" or ;), to stop the shell from interpreting it as the end of the tmux command.

I've split the whole thing into separate lines for readability. If you do this in a script (which I recommend), make sure there's nothing after the final on each line.

Reattach to the session with tmux a, tmux attach, or tmux attach-session (these are all equivalent).

The tmux session will end once both commands have finished executing.