tcpdump(1) on macOS
The text d580b5d1c96c, as Mac OS X 10.3.2, Mac OS X 10.3.1, Mac OS X 10.3 shipped it.
dump traffic on a network
Flags it lists
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-A -
-C -
-D -
-E -
-F -
-L -
-N -
-O -
-R -
-S -
-T -
-U -
-X -
-XX -
-a -
-c -
-d -
-dd -
-ddd -
-e -
-f -
-i -
-l -
-m -
-n -
-p -
-q -
-r -
-s -
-t -
-tt -
-ttt -
-tttt -
-u -
-v -
-vv -
-vvv -
-w -
-x -
-xx -
-y