shell program to check whether the given number is armstrong or not

/* arm.sh */



echo "enter any number"
read num
n=$num
sum=0
while [ $n -gt 0 ]
do
      r=`expr $n % 10`
      sum=`expr sum + (r*r*r)`
      n=`expr $n / 10`
done
if [ $sum -eq $num ]
then
echo "given number is armstrong number"
else
echo "given number is not armstrong"
fi


/home/anil/~$ sh arm.sh
enter any number
153
given number is armstrongnumber

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