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When editing ~/.ssh/authorized_keys manually, sometimes users forget to add a newline at the end of the file, causing the next ssh-copy-id call to append a new key to an existing key, invalidating both keys. This can be fixed by simply adding a newline before appending the key. Something like this change to openssh-source/openssh-6.7p1/contrib/ssh-copy-id might work: # Assuming that the remote