1)Write a Bash shell script named stars.sh that

a. Take 1 number as an argument and prints a triangle of asterisks that is left-aligned. For

example, if the argument is 4 prints the following:

*

**

***

****

b. If there is not exactly 1 argument, or the argument is not an integer, or the integer is less

than 1, print an error message and exit

c. Hint: Use for loops

2) Write a Bash shell script named calc.sh that

a. Performs addition (+), subtraction (-), multiplication (x), and integer division (/) math

operations.

b. Takes in 2 operands and 1 operator and prints the result. Example: calc.sh 5 + 3 would

print 8 and calc.sh 9 / 2 would print 4

c. If there are not exactly 3 arguments, or the second argument is not one of the operators in

part (a), or first or third argument is not an integer, print an error message and exit

d. If operator is division (/) and second operand is 0, then print error message error: cannot

divide by 0 and exit

e. Hint: Use case statement