.tmux.conf file does not exist, then you can simply create it.
tmux would read it the next time you start
The rest of this answer concerns figuring out what the "default options" are, but note that you don't really need this unless you're interested in what they are.
tmux utility's own
show-options command with the
-g flag will dump all the globally set options in the current
tmux session (i.e.,
tmux has to be running to use it).
So if you're in a
tmux session, your
~/.tmux.conf file is empty, then the following will dump out the default settings:
$ tmux show-options -g >tmux.conf-default
Some options are set by
tmux by inspecting the shell environment. I, for example, get
status-keys vi, presumably because I use Vi key bindings in my shell (
EDITOR is set to
In any case, you'll get the options that way. However, I've noticed that there is very little that I ever have to configure in
tmux. I find it well set up by default for my taste, and I basically just re-set the prefix key to Ctrl+a (the b key is one step too far to the right for comfort on my Dvorak keyboard), and that's that.
If you don't need/want to change anything in the default options, then you don't need a