sftp(1) on FreeBSD
The text b2167ed05ddf, as FreeBSD 12.1-RELEASE, FreeBSD 12.0-RELEASE shipped it.
secure file transfer program
Flags it lists
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-4 -
-6 -
-B -
-C -
-D -
-F -
-P -
-R -
-S -
-a -
-b -
-c -
-f -
-i -
-l -
-o -
-p -
-q -
-r -
-v