sftp(1) on macOS
The text b44427ae0eed, as Mac OS X 10.3.9, Mac OS X 10.3.8, Mac OS X 10.3.7, Mac OS X 10.3.6, Mac OS X 10.3.5, Mac OS X 10.3.4, Mac OS X 10.3.3, Mac OS X 10.3.2, Mac OS X 10.3.1, Mac OS X 10.3 shipped it.
Secure file transfer program
Flags it lists
-
-1 -
-B -
-C -
-F -
-R -
-S -
-b -
-o -
-v