generate && add ssh key

gistfile1.txt

Client

ssh-keygen -t rsa

eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_rsa

cat ~/.ssh/id_rsa.pub --> copy

Client (to automatically remain the passphrase)
Put in ~/.bashrc
-----
SSH_ENV="$HOME/.ssh/environment"

function start_agent {
    echo "Initialising new SSH agent..."
    /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}"
    echo succeeded
    chmod 600 "${SSH_ENV}"
    . "${SSH_ENV}" > /dev/null
    /usr/bin/ssh-add;
}

# Source SSH settings, if applicable

if [ -f "${SSH_ENV}" ]; then
    . "${SSH_ENV}" > /dev/null
    #ps ${SSH_AGENT_PID} doesn't work under cywgin
    ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
        start_agent;
    }
else
    start_agent;
fi
----
Login again and enter the passphrase
Login again and no passphrase is requested


Server 
nano /home/--USER--/.ssh/public.pub
paste, save & close
cat /home/--USER--/.ssh/public.pub >> /home/--USER--/.ssh/authorized_keys