Reset An Option Back To Its Default Value

Once you start changing the values of options, tmux can be opaque about what the original default values were.

For instance, if you change the escape-time option with the following command:

$ tmux set-option -g escape-time 0

It's now set to 0, so without digging through the tmux man pages, how do you figure out what the default was and restore it?

The set-option command takes the -u flag to unset the option. This will restore it to the default.

$ tmux set-option -u escape-time

And you can now see the original default value with show-option.

$ tmux show-option escape-time
500

Use set-option -u with any option to restore it to its default.

Find set-option in man tmux for more details.