mark is used to mark items for items
that apply other items.  Examples
of these are flint & steel marked for
apply torches, a weapon marked
for improve weapon scrolls.

mark without options shows your
currently marked item.

usage is as follows:
mark sword +3
mark three torches
mark sword

mark will look for best match first, and
then look for matches based on shortened
name, object name, archetype name.
It prints the match it finds.