softflowd(8) on Linux
The text eb471a912ee4, as Debian 12 (Bookworm) shipped it.
Traffic flow monitoring
Flags it lists
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-6 -
-A -
-B -
-C -
-D -
-L -
-N -
-P -
-R -
-S -
-T -
-a -
-b -
-c -
-d -
-h -
-i -
-l -
-m -
-n -
-p -
-r -
-s -
-t -
-v -
-x