Add Reset An Option Back To Its Default Value as a tmux til

tmux/reset-an-option-back-to-its-default-value.md

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+# 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:
+
+```bash
+$ 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.
+
+```bash
+$ tmux set-option -u escape-time
+```
+
+And you can now see the original default value with `show-option`.
+
+```bash
+$ 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.