Normally I have to create a new horizontal pane with Ctrl + b + _ and then resize it down with Ctrl + b + J
How can I configure tmux to do this with just one command?
It turns out I can bind 1 shortcut to do 2 commands separated by ;
bind + split-window -v -c "#{pane_current _path}"\; resize-pane -D 20
Edit: Thank to Meuh's help, now it looks like this
bind + split-window -v -p 20
Edit2: -p
flag is deprecated in tmux 3.4
bind + split-window -l '20%'
-p 20
to the split-window
command.