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Unset a variable, cache variable, or environment variable.



Removes the specified variable causing it to become undefined. If CACHE is present then the variable is removed from the cache instead of the current scope.

If PARENT_SCOPE is present then the variable is removed from the scope above the current scope. See the same option in the :command:set command for further details.

<variable> can be an environment variable such as:



in which case the variable will be removed from the current environment.