Add private key identities to the authentication agent storing passphrase in your keychain.
ssh-add -K ~/.ssh/some-key
Create RSA 2048 bit key.
ssh-keygen -t rsa -b 2048 -C user@domain -f ~/.ssh/some-key
Generate an OpenSSH public key file from private OpenSSH format file.
ssh-keygen -y -f ~/.ssh/some-key >~/.ssh/some-key.pub
Show fingerprint of specified public key file.
ssh-keygen -E md5 -lf ~/.ssh/some-key.pub