Using ssh-agent with ssh by Mark A. Hershberger (weblog)

So that I would always remember:

From Here

This is a neat trick that I can use with terminals:

Put the commands below on your $HOME/.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 

And sure enough, if you log in, the pass key for your ssh-keys will be prompted. After which, you can use the keys without having to type the pass key everytime.