Remove all directories that were added to search paths by C<local::lib> from the
search paths.
+=head2 --shelltype
+
+Specify the shell type to use for output. By default, the shell will be
+detected based on the environment. Should be one of: C<bourne>, C<csh>,
+C<cmd>, or C<powershell>.
+
=head1 METHODS
=head2 ensure_dir_structure_for