Description
PART 1 Simple Command Interpreter
Write a special simple command interpreter that takes a command and its arguments. This interpreter is a program where the main process creates a child process to execute the command using exec() family functions. After executing the command, it asks for a new command input ( parent waits for child). The interpreter program will get terminated when the user enters exit.
Example:
./interpreter
command: pwd
• output command: ls -la
• output command: date
• output
command: ls -lr /foldername
• output
command: tail /etc/passwd | grep username
• output
command: ps -u username | grep firefox
• output
command: cat /etc/passwd
• output command: exit
• terminates the program.
Marks: 15
PART 2 Average Grade Calculator
There are n (n>1) students enrolled in a course. The course covers x number of chapters from a textbook (x > 1).
In each chapter y number of homeworks are assigned (y>=1). The average grade for each homework in all the chapters need to be found out.
To solve this, write program which has the main process as Director process, which reads a file containing grades of all homeworks of all chapters and creates x number of Manager processes. Each Manager process will take care of solving a chapter. Each manager process will create y number of Worker process and pass marks of n students to each of them and they calculate and print the average.
The input file should contain the data according to the value of x and y and n. For example, the input text file and the process tree for x = 2 and y = 2 and n= 10 will look like the following:
X1Y1
X1Y2
X2Y1
X2Y2
Student1
19
17
20
18
Student2
9
6
10
9
Student3
12
11
10
6
Student4
3
7
9
10
Student5
0
5
8
6
Student6
15
13
15
15
Student7
20
18
18
16
Student8
17
19
19
18
Student9
13
15
14
12
Student10
10
13
18
15
Output:
avg
avg
avg
avg
Marks: 15
Submission Instructions
• All the programs MUST be clearly indented and internally documented
• Make sure your programs compile and run without any errors
• Only include c files or txt files for submission. Do not include any executables.
• Save all your programs with meaningful names and zip into a single folder as: Lab4_[your last name here].zip (e.g., Lab4_Xyz.zip)
• Email your code with the subject line, “Task4-CSC33200–Section 6X(41557)-lastname”
• Email: sdebnath@ccny.cuny.edu
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