#keychain : Set Up Secure Passwordless #ssh Access For #backup Scripts
▻http://www.cyberciti.biz/faq/ssh-passwordless-login-with-keychain-for-scripts
OpenSSH offers RSA and DSA authentication to remote systems without supplying a password. keychain is a special #bash script designed to make key-based authentication incredibly convenient and flexible. It offers various security benefits over passphrase-free keys.