Shell Programming and Scripting

#!/bin/bash
#set -x
MAX=255
FILE=$1.dns_list
#declare -a d_arr

if [ -z "$1" ]
then
          echo "Usage: `basename $0` network"
          echo "  e.g.`basename $0` 1.1.1"
          exit 
fi

echo "Remove file $FILE..."
rm $FILE

for (( i = 1; i < $MAX; i++ ))
do
    PARSE=$(host $1.${i})
        if [ $? = 0 ]
          then
             echo "$PARSE" " $1.$i" >> $FILE
        fi
done

cat $FILE | while read i
do
declare -a d_arr
ln=`echo $i | awk '{printf $5 "\t : \t" $6}' |sed 's/\.XYZ\.com\.//g'`
cnt=${#d_arr[@]}
let c=$cnt
d_arr[$c]=$ln       # <<---<<  I think I need double substitution for this stmt
echo ${d_arr[$c]}
done

# For some reason the array does not exist 
cnt1=${#d_arr[@]}
echo "The size of d_arr: $cnt1"
echo "The array ${d_arr[@]}"
exit

let ${d_arr[$c]}=$ln

let ${d_arr[eval $c]}=$ln

d_arr[$c]=$ln

eval "d_arr[$c]=\${ln}"
b

cnt1=${#d_arr[@]}
echo "The size of d_arr: $cnt1"
echo "The array ${d_arr[@]}"