Unix Program To check whether the given number is polindrome or not

Polindrome means a word or a number which gives the same value when  read from both directions(either from left to right order or right to left order.
for example if we take a number 1221 it gives the same number when read from both directions.

The following is the simple unix program to check the given input is polindrome.

 #!/bin/bash

echo -n "Enter number : "

read n

sd=0

rev=""

on=$n

while [ $n -gt 0 ]

do

    sd=$(( $n % 10 )) # get Remainder

    n=$(( $n / 10 ))  # get next digit

    rev=$( echo ${rev}${sd} )

done

if [ $on -eq $rev ];

then

  echo "Number is palindrome"

else

  echo "Number is NOT palindrome"

fi