[Bug 2284] New: ssh-copy-id option to replace one key with another key (or ssh-replace-id command)

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2284

            Bug ID: 2284
           Summary: ssh-copy-id option to replace one key with another key
                    (or ssh-replace-id command)
           Product: Portable OpenSSH
           Version: 6.6p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh-copy-id
          Assignee: unassigned-bugs at mindrot.org
          Reporter: pabs3 at bonedaddy.net

It would be nice to have a way to login to a remote host and replace
one key with another key quickly and safely. The command should do
something like this. I think that sed -i or some combination of grep
commands would be the way to do it. It should probably work like this:

Login with the old key to add the new key
  If failure, print error
  If success, login with the new key and remove the old key.
    If failure, login with the old key and remove the new key.
    If success, print success.

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