SHELL SCRIPT TO REVERSE THE DIGIT OF A GIVEN NUMBER

echo "Enter the number"                                       
read x
s=0
while [ $x -gt 0 ]
do
r=`expr $x \% 10`
s=`expr $s \* 10 + $r`
x=`expr $x \/ 10`
done

echo "$s"

                                                               OUTPUT

biswarup@biswarup-desktop:~$ sh
$ sh reverse1.sh
enter the number
123
321
$