I am readinga file lin by line and based craeting a arry of unique elemenst from the second column of the line. However when i coem out of the while loop my array becomes empty , can eny one tell me what I would be doing wrong
#!/bin/bash

logfile="./mylog.dat"
begin=100
end="$(( $begin + 1000 ))!d"
index=0
Isthere=0
ENGINES=""

sed "$begin, $end" $logfile | while read line
do
i=`echo $line | awk -F "," '{print $2}'`
Isthere=0
for item in "${ENGINES[@]}" ; do
if [ "$i" = "$item" ] ; then
echo "Aleady there "
Isthere=1
break
fi
done
if [ "$Isthere" -eq 0 ] ; then
echo "adding $Isthere"
ENGINES[$index]=`expr $i`
index=$(( $index + 1))
fi
# echo $line
done
echo $index ${#ENGINES[@]} # howe ever at this point array is empty
for i in "${ENGINES[@]}" ; do
echo $i
done