'-O' - ON OR BEFORE DATE This option puts a date constraint on the files on which LZX will operate; LZX will ONLY operate on any files which have a modification date equal to or before than that specified as a parameter to this option, in the form "yyyy/mm/dd". Otherwise, this option behaves in an analagous fashion to the -o (On or after date) option. VALIDITY This option is valid with the following commands: a (add) d (delete) e (extract) f (freshen) l (list) r (replace) t (test) u (update) v (view) x (extract)