ssh agent autodetection

# Add this to your .bashrc to automatically detect running ssh-agents and connect to them.

if [ "x$SSH_AGENT_PID" = "x" ]; then
    # Set the ssh-agent PID to the oldest ssh-agent owned by the current user
    export SSH_AGENT_PID=$(pgrep -U $USER -o ssh-agent)
    if [ "x$SSH_AGENT_PID" = "x" ]; then
        eval $(ssh-agent)
    else
        # Find the auth socket for this PID in /tmp
        export SSH_AUTH_SOCK=$(find /tmp/ssh-* -type s -name agent.$((SSH_AGENT_PID - 1)) -print -quit 2>/dev/null)
    fi
    if [ "x$SSH_AUTH_SOCK" = "x" ]; then
        echo "Error setting up ssh-agent. You're gonna have to type a lotta passwords!"
    fi
fi