How to find the fingerprint of the ssh server key?

Question

linux

Actually a subject in a question. You need to find out the fingerprint of the ssh server, but not when connected, but on the ssh server itself (ubuntu 16.04/openssh)

Answer 1

ssh-keygen -l -f <path to the public key of the server>
for example:
ssh-keygen -f /etc/ssh/ssh_host_rsa_key.pub -l