Statistics access traffic of apache logs

#! /bin/bash
sum=0
exec <$1
while read line ;do
size=echo $line | awk ‘{print $10}‘
expr $size + 1 &>/dev/null
if [ $? -ne 0 ];then
continue
fi
((sum=sum+size))
done
echo "The total byes=echo $((${sum}/1024))"

Statistics access traffic of apache logs

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