ssh-keygen - authentication key generation
ssh-keygen [-t TYPE] [-C COMMENT] [-f FILE]Options you will use
-t TYPE- Key type. ed25519 is the modern default: short, fast, strong.
-C COMMENT- A comment, conventionally your email - it is what you see in the GitHub UI.
-f FILE- Output file (default ~/.ssh/id_ed25519).
-l- Show the fingerprint of a key file (-lf key.pub).
-R HOSTNAME- Remove all keys of HOSTNAME from known_hosts - after a server was rebuilt and "REMOTE HOST IDENTIFICATION HAS CHANGED".
-F HOSTNAME- Search known_hosts for HOSTNAME.
-y- Read a private key and print its public key.
-N PASSPHRASE- The new passphrase ("" for none).
-b BITS- Key size (for RSA; ed25519 has a fixed size).
-E HASH- Fingerprint hash: sha256 (default) or md5.
-p- Change the passphrase of a private key.
-q- Quiet.
Examples
$ ssh-keygen -t ed25519 -C "[email protected]"then add ~/.ssh/id_ed25519.pub to GitHub
Try ssh-keygen in a real terminal Free, in your browser - a real Ubuntu terminal to try it in, with missions that check your work.