Display series: 0,1,1,2,3,5,8.......

echo "Enter a number: "
read num
sum=0
a=0
b=1
echo "Series is:"
while [ $sum -le $num ]
do
a=$b
b=$sum
sum=`expr $a + $b`
echo -e "$b \c"
done
echo -e "\n"

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Enter a number:10
Series is:
0 1 1 2 3 5 8