https://bugzilla.mindrot.org/show_bug.cgi?id=2128

            Bug ID: 2128
           Summary: ssh-copy-id doesn't check if a public key already
                    exists in a remote servers ~/.ssh/authorized_keys file
           Product: Portable OpenSSH
           Version: -current
          Hardware: Other
                OS: Other
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh-copy-id
          Assignee: [email protected]
          Reporter: [email protected]

When running ssh-copy-id, the script doesn't do any checking to see if
the public key already exists in the remote authorized_keys file. If
the script is run multiple times (on purpose or by accident) the file
not only gets cluttered but also can get quite large if key
distribution is set to run via cron.

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