ngrep(8) on Linux
The text da13d54badd1, as Debian 3.0 (Woody) shipped it.
network grep
Flags it lists
-
-A -
-D -
-I -
-O -
-T -
-V -
-X -
-d -
-e -
-h -
-i -
-l -
-n -
-p -
-q -
-s -
-t -
-v -
-w -
-x