Password-less Login

ssh/sftp/scp from A to B without being prompted for a password:

Connect to A
type: ssh-keygen -t rsa
- default directory for keyfiles will be ~/.ssh/
- if you do not want to be prompted, leave passphrase blank
copy the contents of .ssh/id_rsa.pub (there should only be one line)
place this line on B, in ~/.ssh/authorized_keys

That's it, you should now be able to ssh/sftp/scp from A to B without being prompted for a password!