Shell Scripting #5 - Palindrome Script

#!/bin/sh

echo -n "Enter a String : "

read string

original=$string

length=${#string}

reversed=""

for (( i=$length ; i>0 ; i-- ))

do

        reversed=$reversed""${string:$i-1:$i}

        string=${string%${string:$i-1:$i}}

done

string=$original

#reversed=`echo $string | rev`

if test $string = $reversed

then

        echo "Valid Palindrome String"

else

        echo "Invalid Palindrome String"

fi