Shell program to find out whether the given number is prime or not.

# shellprime.sh

# Program :         To find out whether the given number is prime or not.

# Author :             sujith

# Date :              16/03/2015

clear

echo "Enter the number"

read n

flag=0

i=2

if test $n -lt 1

 then

 flag=1

fi

 while test $i -lt $n

        do

        r=$(echo "$n%$i" | bc)

         if test $r -eq 0

         then

           flag=1

         fi

        i=`expr $i + 1`

        done

if test $flag -eq 0

then

echo "It is a prime number"

else

echo "It is not  a prime number"

fi

Output:

[141740@localhost ~]$ sh shellprime.sh

Enter the number

2

It is a prime number

[141740@localhost ~]$

Enter the number

8

It is not  a prime number

[141740@localhost ~]$