tcpdump(8) on Linux
The text 37b8a0e76d81, as Debian 3.0 (Woody) shipped it.
dump traffic on a network
Flags it lists
-
-E -
-F -
-N -
-O -
-R -
-S -
-T -
-X -
-a -
-c -
-d -
-dd -
-ddd -
-e -
-f -
-i -
-l -
-m -
-n -
-p -
-q -
-r -
-s -
-t -
-tt -
-v -
-vv -
-vvv -
-w -
-x