Command to send public key to remote host

I remember there is a command to send public key to the remote host that I want. I want to use that feature to send one of my public keys to the other host. How can I do that?

Can I send my public SSH key?

Conceivably, you can share the public key with anyone without compromising the private key; you store it on the remote system in a . ssh/authorized_keys directory. To use SSH public key authentication: The remote system must have a version of SSH installed.

You are looking for ssh-copy-id. All this command does is create .ssh and .ssh/authorized_keys and set their permissions appropriately if they don't exist. Then it appends your public key to the end of .ssh/authorized_keys.