How to copy SSH public key to server

You have to copy your SSH public key to the server's SSH authorized_keys file in order to passwordlessly log in to the server. You can copy your SSH key to the server via any of these methods:

Copy SSH key using ssh-copy-id

Use SSH's bundled command, ssh-copy-id
```
$ ssh-copy-id user@host
```
If you want to use other public key rather that then one in the default location, use the -i option as the following
```
$ ssh-copy-id -i ~/.ssh/other_key.pub username@host
```

Manually add SSH key to authorized_keys file

Manually append the content of your public key file (normally ~/.ssh/id_rsa.pub to the server's ~/.ssh/authorized_keys

Remotely add SSH key to authorized_keys via Bash script

Using the following simple Bash script

$ cat ~/.ssh/id_rsa.pub | ssh user@host 'cat >> ~/.ssh/authorized_keys