SSH/4/UPDATE_PUBLICKEY:When deciding whether to update the key [public-key-name] which already existed, the user chose [Y/N].
When deciding whether to update the key which already existed, the user needs to confirm.
[public-key-name]
indicates the name of a public key.
[Y/N]
prompts a user to confirm the action.
A confirmation is required for the user to run a command.