tcpbench(1) on OpenBSD
The text f0edd1a7c519, as OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1 shipped it.
TCP/UDP benchmarking and measurement tool
Flags it lists
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-B -
-S -
-T -
-V -
-b -
-k -
-l -
-n -
-p -
-r -
-s -
-t -
-u -
-v