--login

ssh --login
ssh user@host bash --login -i

su

 -, -l, --login                  make the shell a login shell 

• SSH: ssh, TLS, .ppk, .pem, .crt, .pub, ED25519, Key exchange method (KEX), public key, private key, ssh -Q kex, IAMUserSSHKeys, known_hosts, ssh tunnel, Dropbear