nfdump(1) on Linux
The text e59c7244af6d, as Debian 6.0 (Squeeze) shipped it.
netflow display and analyze program
Flags it lists
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-A -
-B -
-D -
-I -
-K -
-L -
-M -
-N -
-O -
-R -
-V -
-X -
-Z -
-a -
-b -
-c -
-f -
-h -
-i -
-j -
-l -
-m -
-n -
-o -
-q -
-r -
-s -
-t -
-v -
-w -
-x -
-z