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This is what I have in my . tmux.conf for SSH you can adapt
bind-key S command-prompt -p "ssh to:","port:" "new-window -n %1 'ssh %1 -p %2'"
That means when I press C-b, SHIFT S it asks what IP to connect to (type it in when it asks on the status bar of TMUX), press enter, the it asks the port to use.
bind-key S command-prompt -p "ssh to:","port:" "new-window -n %1 'ssh %1 -p %2'"
Brilliant. I removed the port since I usually use my ssh config or I can just type with with : and it's what I needed. Cheers
In tmux, you usually set configuration options with set -g in tmux.conf. "-g" sets a global option which will apply to all new windows and sessions, otherwise the option applies only for the current window, which is usually not what you want.
Since command-alias is an array, you can use the -a flag to append a new value at the end.
With that said, try this:
set -ga command-alias s="new-window ssh foo"
Keep in mind that run in tmux runs a shell command in the background, so you most likely want to use something like new-window or new-session instead.