sftp(1) on OpenBSD
The text cd7a2264d106, as OpenBSD 6.1, OpenBSD 6.0 shipped it.
secure file transfer program
Flags it lists
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-1 -
-2 -
-4 -
-6 -
-B -
-C -
-D -
-F -
-P -
-R -
-S -
-a -
-b -
-c -
-f -
-i -
-l -
-o -
-p -
-q -
-r -
-v