ssh add new key

eval `ssh-agent`

$ eval "$(ssh-agent -s)"
> Agent pid 59566

ssh-keygen -t rsa -C "[email protected]"

ssh-keygen -t rsa -b 4096
ssh-keygen -t dsa
ssh-keygen -t ecdsa -b 521
ssh-keygen -t ed25519

ssh-copy-id -i ~/.ssh/mykey.pub user@host