[github] Calculate RSA key fingerprint

Sometimes you can have a bunch of keys in your ~/.ssh directory, and don't know which matches the fingerprint shown by GitHub/Gitlab/etc.

Here's how to show the key filenames and MD5 fingerprints of all the keys in your ~/.ssh directory:

cd ~/.ssh
find . -type f -exec printf "\n{}\n" \; -exec ssh-keygen -E md5 -lf {} \;

(For what the parameters mean, refer to this answer about the find command.

Note that the private/public files that belong to one key have the same fingerprint, so you'll see duplicates.

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