sftp(1) on macOS
The text 411d121f951b, as Mac OS X 10.6.8, Mac OS X 10.6.7, Mac OS X 10.6.6, Mac OS X 10.6.5, Mac OS X 10.6.4, Mac OS X 10.6.3, Mac OS X 10.6.2, Mac OS X 10.6.1, Mac OS X 10.6 shipped it.
secure file transfer program
Flags it lists
-
-1 -
-B -
-C -
-F -
-P -
-R -
-S -
-b -
-o -
-v