tmux pane titles

.tmux.conf

# tmux config file

# the rest of your config file ...

# This example creates a variable named `custom_pane_title` which will be 
# displayed if and only if it has been set -- in this case by by your 
# tmuxinator pane commands.
# This feature doesn't seem to be documented, otherwise I'd provide a link. 
# I _believe_ this feature requires tmux >= 3.0
set -g pane-border-format "#{pane_index}#{?@custom_pane_title,:#{@custom_pane_title},}:#{pane_title}"

some.sh

tmux set-option -p -t pane-name:0.0 @custom_pane_title "vim" && vim