redhat man page for unset

unset(n)						       Tcl Built-In Commands							  unset(n)

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NAME
       unset - Delete variables

SYNOPSIS
       unset name ?name name ...?
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DESCRIPTION
       This  command removes 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, and any variables after the non-existent one are not deleted.

KEYWORDS
       remove, variable

Tcl																	  unset(n)