ubuntu generate ssh key

C++
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 ed25519cat ~/.ssh/id_rsa.pub | ssh username@remote_host "mkdir -p ~/.ssh && touch ~/.ssh/authorized_keys && chmod -R go= ~/.ssh && cat >> ~/.ssh/authorized_keys"
ssh-copy-id -i ~/.ssh/id_rsa.pub user@server
Source

Also in C++: