bash shell scripting problem: Write a script to determine if a parameter supplie

Question

bash shell scripting problem:

Write a script to determine if a parameter supplied to the script is a palindrome or not. A palindrome is a string that reads the same forward and backward. To accomplish this, you will need to loop from 0 to the halfway point in the string and compare the character at location i to the character at location length – i – 1 where length is the length of the string. If, after passing halfway through, the two compared characters match in each iteration, then output the parameter and that it is a palindrome, else output the parameter and that it is not a palindrome.

Explanation / Answer

#!/bin/bash
echo "Parameter supplied is Palindrome or not"
inputString=$1
isPalindrome=1
# Get length of the inputString.
len=${#inputString}

#get the halfway value by dividing len/2.
halfway=$((len/2))

for ((i=1;i<=halfway;i++))
do
   c1=`echo $inputString|cut -c$i`         
   c2=`echo $inputString|cut -c$len`       

   if [ $c1 != $c2 ]
   then
        isPalindrome=0

        break 2           
   fi

   let len--
done

if [ isPalindrome -eq 1 ]
then
     echo ""$inputString" is a Palindrome"
else
     echo ""$inputString" is not a Palindrome"
fi

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