sftp(1) on macOS
The text ba8c8fa6f2ef, as macOS 10.15.3, macOS 10.15.2, macOS 10.15.1, macOS 10.15, macOS 10.14.6, macOS 10.14.5, macOS 10.14.4, macOS 10.14.3, macOS 10.14.2 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