TMUX: After split-window, how do I know the new pane id?

Another way, especially useful for shell scripts.

tmux split-window -P -F "#{pane_id}"

will output the pane id, (e.g. %4) into stdout

so you can do

bash_var=$(tmux split-window -P -F "#{pane_id}"

if you want to capture it in a shell/bash variable.

Taken from here: https://github.com/tmux-plugins/tmux-sidebar/blob/master/scripts/toggle.sh

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