.bash_profile

# File: ~/.bash_profile

# source ~/.profile, if available
if [[ -r ~/.profile ]]; then
  . ~/.profile
fi

# start agent and set environment variables, if needed
agent_started=0
if ! env | grep -q SSH_AGENT_PID >/dev/null; then
  echo "Starting ssh agent"
  eval $(ssh-agent -s)
  agent_started=1
fi

# ssh become a function, adding identity to agent when needed
ssh() {
  if ! ssh-add -l >/dev/null 2>-; then
    ssh-add ~/.ssh/id_rsa
  fi
  /usr/bin/ssh "$@"
}

git() {
  if ! ssh-add -l >/dev/null 2>-; then
    ssh-add ~/.ssh/id_rsa
  fi
  /usr/bin/git "$@"
}


export -f ssh
export -f git

bash prompt

simon@simon-ubuntu64:~ $ ssh staging
Linux staging-guest 2.6.35-27-server #48-Ubuntu SMP Tue Feb 22 21:53:16 UTC 2011 x86_64 GNU/Linux
Ubuntu 10.10

Welcome to the Ubuntu Server!
 * Documentation:  http://www.ubuntu.com/server/doc

53 packages can be updated.
29 updates are security updates.

Last login: Tue Apr 26 11:16:50 2011 from simon-ubuntu64.local
Starting ssh agent
Agent pid 11033
Enter passphrase for /home/simon/.ssh/id_rsa: 
simon@staging-guest:~ $