1. Write a script in Bourne shell that presents a user with amenu as follows:
Add the numbers (enter a or A)
Subtract the numbers (enter s or S)
Multiply the numbers (enter m or M)
Divide the numbers (enter d or D)
Exit (select e or E)
If the user enters any other character other than the onesmentioned, then print an error saying it is not a choice and askthe user to select again until the correct option is chosen.
Once the operation is done, ask the user if they want to doanother operation on the same two integers or do another operationwith two different integers
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