I use
ctrl-z
(instead of ctrl-b) for my tmux prefix key. I also have ctrl-z ctrl-z
configured to toggle back and forth between the previously visited window.
With that in mind, I needed to set up a specific keybinding to send the prefix
key to an inner (nested) tmux session. That's because sometimes, like with a
tool such as overmind, you can end up connected to a tmux session while
already within a tmux session.
So, I have Ctrl-z a send the prefix key to the inner tmux session. This is
what I added to my
tmux.conf:
# send prefix to inner tmux session (C-z a)
bind-key a send-prefix
Simply doing Ctrl-z d will detach me from the outer tmux session. If I want to
detach from an inner tmux session, I can use my new keybinding -- Ctrl-z a d.