openwrt find mac location

COUNT=0
LOC=0
while [[ $COUNT -lt 3 ]]
do
  RESULT=`dd if=/dev/mtd0ro skip=${i} bs=1 count=8 2>/dev/null`
  if [[ "${RESULT}" == 'macaddr=' ]]
  then
    [[ ${COUNT} -eq 0 ]] & MACLOCATION_0=$(( $LOC + 8 ))

    MAC=`dd if=/dev/mtd0ro skip=${MACLOCATION_0} bs=1 count=17 2>/dev/null`
    echo "MAC=[${MAC}]"

    echo "FOUND [${COUNT}] at address [${LOC}] [${MACLOCATION_0}]"

    COUNT=$(( $COUNT + 1 ))
    [[ $COUNT -eq 3 ]] && break
  fi
  LOC=$(( $LOC + 1 ))
done; echo $COUNT



MAC=[38:2C:4A:E3:84:A8]
FOUND [0] at address [1256] [1264]
MAC=[38:2C:4A:E3:84:A8]
FOUND [1] at address [1644] [1652]
MAC=[38:2C:4A:E3:84:AC]
FOUND [2] at address [2696] [2704]


strings -o /dev/mtd0ro | grep add

admin@RT-AC68P-4131SP:/tmp# strings -o /dev/mtd0ro | grep macaddr
   2345 et0macaddr=38:2C:4A:E3:84:A8
   3152 0:macaddr=38:2C:4A:E3:84:A8
   5206 1:macaddr=38:2C:4A:E3:84:AC
admin@RT-AC68P-4131SP:/tmp#




strings -o /dev/mtd0ro | grep macaddr

for LOCATION in 1 2 3
do

  # find the offset of the beginning of the line containing "macaddr"
  RAWOFFSETOCT=$(( `strings -o /dev/mtd0ro | grep macaddr | head -n${LOCATION} | tail -n1 | awk '{print $1}'`))

  # convert the offset to decimal
  RAWOFFSETDEC=`printf "%d" \0${RAWOFFSETOCT}`

  # get the string
  RAWMAC=`strings -o /dev/mtd0ro | grep macaddr | head -n${LOCATION} | tail -n1 | awk '{print $2}'`

  # find how many characters there are leading up to the mac itself
  RAWSKIP=$(( ${#RAWMAC} - 17 ))

  # Add the number of leading characters to the offset for the MAC offset
  MACOFFSET=$(( $RAWOFFSETDEC + $RAWSKIP ))

  # Debug
  echo "RAWOFFSETDEC=[${RAWOFFSETDEC}] RAWMAC=[${RAWMAC}] RAWSKIP=[${RAWSKIP}] MACOFFSET=[${MACOFFSET}]"
  #echo "MACOFFSET=[${MACOFFSET}]"

  # Print the MAC
  MAC=`dd if=/dev/mtd0ro skip=${MACOFFSET} bs=1 count=17 2>/dev/null`
  echo "MAC=[${MAC}]"

done