Write a shell script to check whether the entered number is Armstrong or not

clear

echo enter any number..

read n

m=$n

sum=0

while [ $m != 0 ]

do

            y=`expr $m % 10`

            x=`expr $y \* $y \* $y`

            sum=`expr $sum + $x`

            m=`expr $m / 10`

done

if [ $sum -eq $n ]

then

            echo the number is armstrong...

else

            echo the number is not armstrong...

fi