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Remove offending key from known_hosts file with one swift move

 $ ssh-keygen -R <hostname>

— by openiduser126 on Jan. 25, 2014, 1:35 p.m.

Explanation

The ssh-keygen tool comes with an option for this already, there is no need for esoteric one-liners that are hard to remember.

Say you ssh server.example.com and its host key has changed because you just reinstalled it. Run ssh-keygen -R server.example.com then try to connect to the server again, you'll be presented with the option to save the host key just like new.