Hello Karol,

Thank you for reporting this issue.

What led you to the "impression that this is not applicable to newer
keys"? The manpage specifically says, as you quoted "This operation is
only supported for RSA1 keys and keys stored in the newer OpenSSH
format." And this, in turn, specifically documents that you need to use
the "newer OpenSSH format" for any non-RSA1 key (afaict). And searching
the `man ssh-keygen` page, one gets:

"     For RSA1 keys and keys stored in the newer OpenSSH format, there is also
     a comment field in the key file that is only for convenience to the user
     to help identify the key.  The comment can tell what the key is for, or
     whatever is useful.  The comment is initialized to “user@host” when the
     key is created, but can be changed using the -c option.
"

I agree that the comment being reported as '(null)' is probably a real
bug, but it most likely should be filed upstream if it reproducible with
the latest versions.

In which bug tracker is 811125 that you referred to? It is not an Ubuntu
bug, afaict.

Thanks,
Nish

** Changed in: openssh (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1615305

Title:
  Output when changing comment is weird and badly documented

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