openssh unix dev - Aug 2010 - [Feature Request] delete defined line in known_hosts file

Hi,

for a test lab, I'm trying to write a small shell script that will
eradicate all information regarding a special host from the
known_hosts file. Unfortunately, it is quite non-trivial to find out
what ssh doesn't like with a host.

ssh says which line in known_hosts has the offending key, but
ssh-keygen -R doesn't take a line number. Am I using an undocumented
interface when I simply use sed to delete the appopriate line?

If so, it would be good if ssh-keygen -R would also take a line number
to delete from the known_hosts file.

Greetings
Marc

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On Fri, 20 Aug 2010, Marc Haber wrote:
> Hi,
> 
> for a test lab, I'm trying to write a small shell script that will
> eradicate all information regarding a special host from the
> known_hosts file. Unfortunately, it is quite non-trivial to find out
> what ssh doesn't like with a host.
> 
> ssh says which line in known_hosts has the offending key, but
> ssh-keygen -R doesn't take a line number. Am I using an undocumented
> interface when I simply use sed to delete the appopriate line?
not at all, the known_hosts is defined to be a file containing one
key per line.
> If so, it would be good if ssh-keygen -R would also take a line number
> to delete from the known_hosts file.
There is no need, other tools exist that do this job file.

-d