From the NannyMUD documentation

LAST CHANGE

2000-12-08

COMMAND

NAME
        Undo - Destruct one or more objects.


LOCATION
	Wizmod, module 'default'.

SYNTAX
	Undo [-frR] 

DESCRIPTION
	This command will destruct one or more objects, taking dangerlevel into
	account.

	Flags:
	-f	Don't care about dangerlevels.
	-r	Destruct everything at the target location.
	-R	Destruct everything at the target location recursively.


SEE ALSO
        destruct in efun/object_related/destruct
        destruct in wizcommands/object/destruct