ssh(1) on macOS
The text a68374ebcbc3, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.
OpenSSH SSH client (remote login program)
Flags it lists
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-y