Persistent ssh-agent on remove box

add_to_bash_profile.sh

# setup ssh-agent
agent_env_file=~/.ssh/agent.env
agent_sock=~/.ssh/agent.sock
if [ -f $agent_env_file ] ; then
  . $agent_env_file > /dev/null
  if ! kill -0 $SSH_AGENT_PID > /dev/null 2>&1; then
    echo "Stale agent file found. Spawning new agent ..."
    eval `ssh-agent -t 4h -a $agent_sock | tee $agent_env_file`
    ssh-add
  fi
else
  echo "Starting ssh-agent ..."
  eval `ssh-agent -t 4h -a $agent_sock | tee $agent_env_file`
  ssh-add
fi