Finding Given Number is Palindrome or not

Linux (Finding Given Number is Palindrome or not)
echo "Palindrome Checking"
echo "~~~~~~~~~~ ~~~~~~~~"
echo "Enter The Number"
read num
num1=$num
r=0
while test $num -gt 0
do
dig=`expr $num % 10`
r=`expr $r \* 10 + $dig`
num=`expr $num / 10`
done
echo "Reversal Number Is" $r
if test $r -eq $num1
then
echo "Given number is palindrome"
else
echo "Given number is not palindrome"
fi