Bash Profile script to setup ssh agent so that operations such as ssh and git don't ask for a password to decrypt public keys every time.

ssh-agent-on-cygwin.sh

# Paste in ~/.bash_profile
#
# Load ssh-agent. Taken from
# http://blog.killtheradio.net/how-tos/ssh-agent-on-cygwin/
SSHAGENT=/usr/bin/ssh-agent
SSHAGENTARGS="-s"
if [ -z "$SSH_AUTH_SOCK" -a -x "$SSHAGENT" ]; then
	eval `$SSHAGENT $SSHAGENTARGS`
	trap "kill $SSH_AGENT_PID" 0
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 "$@"
}
export -f ssh

# another example: git
git() {
  if ! ssh-add -l >/dev/null 2>&-; then
    ssh-add ~/.ssh/id_rsa
  fi
  /usr/bin/git "$@"
}
export -f git