Write a shell script that prompts user to enter a negative integer. If the user enters a positive integer or 0, the shell script will continuously prompt the user to enter a negative integer until a negative integer is entered and read. The shell will then print the accepted negative integer to the terminal. [

Write a shell script that prompts the user for a grade between 0 and 100. The shellscript should calculate the corresponding letter for this grade based on the followingcriteria:0–49 = F50–59 =D60–69 = C70–79= B80–100 = AEnsure that the shell script continues to prompt the user for grades until the userchooses to exit the shell script.

QUESTION 3: Execute the given program in MARS and answer the following short questions. .text main: li $a0,5 jal func1 li $v0,1 syscall j func3 func1: addiu $sp, $sp, -8 sw $ra, 4($sp) sw $a0, 0($sp) addi $a0,$a0,5 jal func2 Iw $a0, 0($sp) Iw $ra, 4($sp) jr $ra func2: addi $a0,$a0,5 jr $ra func3: li $v0,10 syscall i. What do we need to decrement $sp by 8 in the instruction addiu $sp, $sp,-8? ii. What is the value of $a0 at the end of func2? At the end of program, the value of $a0 is 5 (printed on screen). Why? iii. func1 is supposed to free-up stack before it returns back to the caller. Write down the instruction we must use to free-up stack. iv. The program will not terminate properly if we remove the instruction Iw $ra, 4($sp). Why? v. Make changes in this program to use jalr instead of jal. Write down your changes here.

In terminal Bob enters below: A="Hello" B="CST8207" echo $AB -What would be the output? АВ Hello CST8207 O Nothing HelloB