sftp(1) on OpenBSD
The text ff833224d9c4, as OpenBSD 6.9 shipped it.
OpenSSH secure file transfer
Flags it lists
-
-4 -
-6 -
-A -
-B -
-C -
-D -
-F -
-J -
-N -
-P -
-R -
-S -
-a -
-b -
-c -
-f -
-i -
-l -
-o -
-p -
-q -
-r -
-v