load a private key for 24 hours in the ssh-agent

agent.sh

# if we have private keys, load ssh-agent or connect to an already running agent
if [ -r $HOME/.ssh/id_rsa -o -r $HOME/.ssh/id_dsa -o -r $HOME/.ssh/identity ]; then
  SSH_SOCKET=$HOME/.ssh/.ssh-socket

  # ensure socket
  ps -cx | grep -q '[s]sh-agent'

  if [ 0 -ne $? ]; then
    old_umask=$(umask)
    umask 0077
    ssh-agent -t 86400 > $SSH_SOCKET
    umask $old_umask
  fi

  # if $SSH_SOCKET exists, is readable and is not empty, then add my key
  if [ -r $SSH_SOCKET -a -s $SSH_SOCKET ]; then
	  . $SSH_SOCKET
	  ssh-add -l | grep -qi 'no ident' && ssh-add -t 86400
  else
    echo "Socket not readable"
  fi
fi