function onCommand( options ) {
		var opts;
		if ( arguments.length ) {
			opts = options;
		} else {
			opts = {};
		}
		repl._context.clearWorkspace( repl._currentWorkspace, opts );
	}
Deletes user-defined variables in the current workspace.

@private
@param {Options} [options] - function options
@param {(RegExp|ArrayLikeObject)} [options.include] - name inclusion filter
@param {(RegExp|ArrayLikeObject)} [options.exclude] - name exclusion filter