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- unset
- -----
- Unset a variable, cache variable, or environment variable.
- ::
- unset(<variable> [CACHE | PARENT_SCOPE])
- 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:
- ::
- unset(ENV{LD_LIBRARY_PATH})
- in which case the variable will be removed from the current
- environment.
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