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- unset name ?name name ...?
- Remove one or more variables. Each name is a variable
- name, specified in any of the ways acceptable to the
- set command. If a name refers to an element of an
- array, then that element is removed without affecting
- the rest of the array. If a name consists of an array
- name with no parenthesized index, then the entire array
- is deleted. The unset command returns an empty string
- as result. An error occurs if any of the variables
- doesn't exist, or if any of the variables has an active
- trace.
-