SSH login without password

gistfile1.sh

# First, on the local machine you will want to generate a secure SSH key:

ssh-keygen

# Walk through the key generator and set a password, the key file by default goes into ~/.ssh/id_rsa
# If you have named it differently, you have to add the private key manually:

ssh-add -K path/to/my_key

# Next, you need to copy the generated key to the remote server you want to setup passwordless logins with
# his is easily done with the following command string but you can use scp if you’d prefer

cat ~/.ssh/id_dsa.pub | ssh user@remotehost 'cat >> ~/.ssh/authorized_keys'

#Finally, confirm that you can now login to the remote SSH server without a password:

ssh user@remotehost.com

# source:
# http://osxdaily.com/2012/05/25/how-to-set-up-a-password-less-ssh-login/
# https://help.github.com/articles/working-with-ssh-key-passphrases