Airplay to Sonos Bridge Init and Monit Scripts. Credit: http://www.reddit.com/r/raspberry_pi/comments/1xwr8r/add_airplay_to_your_sonos_xpost_from_rsonos/

sonos-airplay.init

#!/bin/bash
#
# This starts and stops shairport
#
### BEGIN INIT INFO
# Provides:          sonos-airplay
# Required-Start:    $network
# Required-Stop:
# Short-Description: Sonos Airplay Bridge
# Description:       Sonos Airplay Bridge
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO


# Source function library.
. /lib/lsb/init-functions

RETVAL=0

start() {
        echo -n "Starting Sonos-Airplay: "
        mkfifo /tmp/airplay2sonos
        chmod 666 /tmp/airplay2sonos
        /bin/su - shairport -c "/usr/local/bin/shairport -d -a Sonos -P /home/shairport/shairport.pid -l /home/shairport/shairport.log -e /home/shairport/shairport.err -B \"echo -e 'play\nlogout'|nc localhost 7070\" -o pipe /tmp/airplay2sonos"&
        /bin/su - vlc -c "/usr/bin/vlc -d --pidfile /home/vlc/vlc.pid --logfile /home/vlc/vlc.log -I rc --rc-host localhost:7070 --demux=rawaud --rawaud-channels 2 --rawaud-samplerate 44100 /tmp/airplay2sonos :sout='#gather:transcode{acodec=mp3,ab=256,channels=2,samplerate=44100}:http{mux=raw,dst=:8081}' :sout-keep :repeat"
}

stop() {
        echo -n "Shutting down Sonos-Airplay: "
        rm -f /tmp/airplay2sonos
        kill -9 `cat /home/shairport/shairport.pid`
        kill -9 `cat /home/vlc/vlc.pid`
        # in case there's more than one vlc running..
        killall -9 vlc
}

restart() {
    stop
    sleep 1
    start
}

case "$1" in
    start)
        start
    ;;
    stop)
        stop
    ;;
    status)
        status shairport
    ;;
    restart)
        restart
    ;;
    *)
        echo "Usage: $0 {start|stop|status|restart}"
    ;;
esac

exit 0

sonos.monit

check process sonos-airplay with pidfile /home/vlc/vlc.pid
   start program = "/etc/init.d/sonos-airplay start"
   stop program = "/etc/init.d/sonos-airplay stop"
   if changed pid then restart
   if failed host 127.0.0.1 port 5002 then restart
   if failed host 127.0.0.1 port 8081 then restart