ssh(1) on macOS
The text c509367aaa09, as Mac OS X 10.0.1, Mac OS X 10.0 shipped it.
OpenSSH secure shell client (remote login program)
Flags it lists
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-A -
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-T -
-X -
-a -
-c -
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-f -
-g -
-i -
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-l -
-n -
-o -
-p -
-q -
-t -
-v -
-x