How to print out SSH key fingerprints

This is useful for comparing keys from GitHub or from SSH.

To print out keys in SHA1 format:

ssh-keygen -l -f ~/.ssh/foobar.id_rsa

To print out keys in MD5 format:

ssh-keygen -l -E md5 -f ~/.ssh/bazbarn.id_rsa

Remember to change the filename as required.

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