mtrace(8) on OpenBSD
The text 1cdd2e9cfb6d, as OpenBSD 4.1 shipped it.
print multicast path from a source to a receiver
Flags it lists
-
-M -
-S -
-g -
-i -
-l -
-m -
-n -
-p -
-q -
-r -
-s -
-t -
-v -
-w