Script:
---------

================================================================================
#!/usr/bin/sh

###-------------------------------------------------------------------------###
# environment
###-------------------------------------------------------------------------###
SECURITY_DIR=~/security
LOGIN=`whoami`
AGENT_INFO_FILE="${LOGIN}-agent-info"

###-------------------------------------------------------------------------###
# functions
###-------------------------------------------------------------------------###

#*******************************************************
# start agent and load key
#*******************************************************
load_keys () {
  echo "\nChecking for existance of running ssh-agent..."

  if [ -f ${SECURITY_DIR}/${AGENT_INFO_FILE} ]; then
    . ${SECURITY_DIR}/${AGENT_INFO_FILE}
    ps -p ${SSH_AGENT_PID}

    if [ $? -eq 0 ]; then
      echo "Your agent appears to be running."
    else
      echo "Your agent doesn't appear to be running."
      STARTAGENT=1
    fi
  else
    STARTAGENT=1
  fi

  if [ "${STARTAGENT}" -eq 1 ]; then
    echo "Starting key agent..."
    ssh-agent | head -2 > ${SECURITY_DIR}/${AGENT_INFO_FILE}
    chmod g-r,g-w,g-x,o-r,o-w,o-x ${SECURITY_DIR}/${AGENT_INFO_FILE}
    . ${SECURITY_DIR}/${AGENT_INFO_FILE}
    chmod g-r,g-w,g-x,o-r,o-w,o-x ${SSH_AUTH_SOCK}
  else
    echo "Key Agent running"
  fi

  echo "Sourcing agent-info file [${AGENT_INFO_FILE}]..."
  . ${SECURITY_DIR}/${AGENT_INFO_FILE}

  echo "Adding key..."
  ssh-add

  echo "\nLoaded keys:\n"
  ssh-add -l

  echo "\n*** Lastly, run the following command:"
  echo ". ${SECURITY_DIR}/${AGENT_INFO_FILE}"
}

#*******************************************************
# unload key and stop agent
#*******************************************************
unload_keys () {
  echo "\nChecking for existance of running ssh-agent..."

  if [ -f ${SECURITY_DIR}/${AGENT_INFO_FILE} ]; then
    . ${SECURITY_DIR}/${AGENT_INFO_FILE}

    ps -p ${SSH_AGENT_PID}
    if [ $? -eq 0 ]; then
      echo "Your agent appears to be running."
      echo "Removing key entries..."
      ssh-add -d
      echo "Stopping key agent..."
      kill -HUP ${SSH_AGENT_PID}
    else
      echo "Your agent doesn't appear to be running."
    fi
    rm ${SECURITY_DIR}/${AGENT_INFO_FILE}
  else
    echo "Unable to find agent info files [${AGENT_INFO_FILE}]"
    exit 0
  fi
}

###-------------------------------------------------------------------------###
# main
###-------------------------------------------------------------------------###
ARG=$1

case "${ARG}" in
    load) load_keys ;;
  unload) unload_keys ;;
       *) echo "\nUsage: $0 {load|unload}"
          exit 2 ;;
esac

###-------------------------------------------------------------------------###
# end
###-------------------------------------------------------------------------###
exit 0

================================================================================


Add to .profile;
----------------

SSH_ENV_FILE="./security/myuser-agent-info"
if [ -f $SSH_ENV_FILE ]; then
        echo "Accessing information for ssh-key-agent..."
        . $SSH_ENV_FILE
        ssh-add -l
else
        echo "SSH key agent not running. Loading now..."
        ./control_ssh_key_agent.ksh load
        . $SSH_ENV_FILE
        ssh-add -l
fi