ssh-keygen(1) on macOS
The text f0d9ad439e7b, as Mac OS X 10.2.8.G5, Mac OS X 10.2.8, Mac OS X 10.2.7, Mac OS X 10.2.6, Mac OS X 10.2.5, Mac OS X 10.2.4, Mac OS X 10.2.3, Mac OS X 10.2.2, Mac OS X 10.2.1, Mac OS X 10.2 shipped it.
authentication key generation, management and conversion
Flags it lists
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-B -
-C -
-D -
-N -
-P -
-U -
-b -
-c -
-e -
-f -
-i -
-l -
-p -
-q -
-t -
-y