Edit: If you have a newer OS, you may need to change this line in the script....
cdrecord --eject dev="$1" --data "$ISOFILE" &> /dev/null
to this...
cdrecord --eject dev=ATA:"$1" --data "$ISOFILE" &> /dev/null

#!/bin/bash

#Copyright David Stark 2004
#Program to initiate cdrecord on multiple devices, recording on successive 
#blanks until SIGINT (Ctrl-C) is received.

#Version 0.3.1

#User help
if [ $# == 0 ] || [ $1 == "-h" ] || [ $1 == "--help" ]
    then
    echo "This program starts cdrecord to burn one image file to multiple devices,"
    echo "ejecting the cd when recording has finished. When a blank CD is inserted"
    echo "into any of the specified drives, recording of the image begins again."
    echo ""
    echo "Usage: $0 image devicelist"
    echo ""
    echo "'image' is the name of the image to be burned."
    echo "'devicelist' must be a list of devices which cdrecord understands -"
    echo "                                   see 'man cdrecord' for details."
    echo ""
    echo "Do Ctrl-C to terminate when recording is finished."
    exit 0
fi

#Argument sanity check
if [ $# -lt 2 ]
    then
    echo "Not enough arguments. See '$0 -h' for help."
    exit 1
fi

if ! [ -e $1 ]
    then
    echo "$1 does not exist. Exiting."
    exit 1
fi

ISOFILE=$1

#Function launced for each drive. Launches with new PID.
burndrive()
{
    echo "Please insert a blank CD into $1 to begin."
    while true
      do
      sleep 2
      STATUS=`cdrecord -V --inq dev="$1" 2>&1`
      echo $STATUS | grep "medium not present" &> /dev/null
      if [ $? != 0 ]
	  then
	  echo "CD loaded on $1. Continuing."
	  cdrecord --eject dev="$1" --data "$ISOFILE" &> /dev/null
	  RESULT=$?
	  case $RESULT in
	      0) #Burn completed
		  echo "Burning completed successfully on drive $1."
		  echo "Insert a blank disc to continue on $1.";;
	      254) #Non-blank disc
		  echo "Disc in $1 is not blank."
		  echo "Please insert a blank disc in $1.";;
	      *) #
		  echo "Unknown error on $1. Error num: $RESULT"
		  echo "Please email davidstark (at) myrealbox.com";;
	  esac
      fi
    done
}

for go in "$@"
do
  if [ "$go" != "$1" ]
      then
      burndrive "$go" &
      PIDLIST="$PIDLIST $!" #Collect subshell PIDs
  fi
done

#Kill subshells, then exit
trap "kill -9 $PIDLIST; exit 0" SIGINT

#This sleep loop is just to retain control of the console -
#for message output, and to catch Ctrl-C
while true
  do
  sleep 1000
done