ssh without being prompted for password

if you have public keys on most of your boxes but not all and are
running a script against all of them, but don't want the script to
just pause at the password prompt, then specify the
"PreferredAuthentications" option:

ssh -o PreferredAuthentications=hostbased,publickey

I couldn't get the PasswordAuthentication=no option to work, so the
above saved me

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