````{tab} Linux
If you're using `nano`, type control-`x`, then `y`, then the enter key.
````
````{tab} OS X:
If you're using `nano`, type control-`x`, then `y`, then the enter key.
````
````{tab} Windows:
If you're using `notepad`, type control-`s` or choose `Save` from the `File` menu.
````