Write a linux shell program to perform check whether a number is prime or not using while

Prime or not using while

Click me to definition for prime number

Code:

clear 

echo --------------------------------------------- 

echo '\tPrime number or Not' 

echo --------------------------------------------- 

echo Enter the  number 

read n 

i=2 

ans=0 

while [ $i -le $(expr $n - 1) ] 

do 

        if [ $(expr $n % $i) -eq 0 ] 

        then 

                ans=$(expr $ans + $i) 

        fi 

        i=$(expr $i + 1) 

done 

if [ $ans -eq 0 ] 

then 

        echo The number $n is a prime. 

else 

        echo The number $n is not a prime. 

fi 

Output:

--------------------------------------------- 

Prime number or Not 

--------------------------------------------- 

Enter the number 

11 

The number 11 is a prime