nfreplay(1) on Linux
The text 8d4f543dc0bf, as Debian 11 (Bullseye) shipped it.
netflow replay program
Flags it lists
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-4 -
-6 -
-H -
-V -
-b -
-c -
-d -
-h -
-j -
-p -
-r -
-t -
-v -
-z