OPS435 Assignment 1 A

DRAFT - Under Construction

Assignment 1 - Users' Usage Report

Weight: 20% of the overall grade

Due Date: Ask your professor for exact date

Late Penalty: 10% per school day, and note that this assignment must be completed satisfactorily in order to pass the course even if you get zero mark for this assignment.

Overview

Most system administrators would like to know the utilization of their systems by their users. On a Linux system, the users' login records are normally stored in the binary file /var/log/wtmp. The login records in this binary file can not be viewed or edited directly using normal Linux commands like 'less', 'cat', etc. The 'last' command is often used to display the login records stored in this file in a human readable form. The following listing is a sample output of running the 'last' command:

$ last -F
avhuo    pts/9        10.43.222.35     Tue Feb 13 16:53:42 2018 - Tue Feb 13 16:57:02 2018  (00:03)    
clee18   pts/6        10.40.43.94      Tue Feb 13 16:51:47 2018 - Tue Feb 13 16:56:13 2018  (00:04)    
clee18   pts/6        10.40.43.94      Tue Feb 13 16:50:20 2018 - Tue Feb 13 16:51:27 2018  (00:01)    
shana    pts/2        toroon4512w-lp13 Tue Feb 13 16:47:48 2018 - Tue Feb 13 16:58:31 2018  (00:10)    
hfang171 pts/4        24.114.50.50     Tue Feb 13 16:31:38 2018 - Tue Feb 13 17:48:39 2018  (01:17)    
bigia    pts/8        10.247.6.126     Tue Feb 13 16:28:43 2018 - Tue Feb 13 17:28:31 2018  (00:59)    
ckim16   pts/2        10.40.91.236     Tue Feb 13 16:22:36 2018 - Tue Feb 13 16:45:10 2018  (00:22)    
ddchan   pts/2        10.43.115.162    Tue Feb 13 16:19:29 2018 - Tue Feb 13 16:22:00 2018  (00:02)    
tsliu2   pts/4        10.40.105.130    Tue Feb 13 16:17:21 2018 - Tue Feb 13 16:30:10 2018  (00:12)    
shana    pts/13       10.40.91.247     Tue Feb 13 16:07:52 2018 - Tue Feb 13 16:45:52 2018  (00:38)    
tchiu2   pts/11       10.40.105.130    Tue Feb 13 16:07:43 2018 - Tue Feb 13 16:17:12 2018  (00:09)    
   
...

In this assignment, your task is to create a python program with well designed functions to produce daily, weekly, and monthly usage report by user or remote host based on the information obtained from the 'last' command.

Instructions

Program Name and valid command line arguments

Name your Python3 program as usage_report.py. The program should accept zero or more command line parameters:

• filename, or
• filename1 filename2 etc ... - any number of filenames from 1 to as many as the command-line supports.

If there is no command line argument, your python program should get the login records from the 'last' command with the appropriate flags.

If there is one filename provided at the command line, gets the login records from the contents of the given file. The format of the lines in the file should be the same as the output of 'last -F'.

If there is more than one filename provided, merges all the files together with the first one at the top and the last one at the bottom. Read and process the file contents in that order in your program.

Header

All your Python codes for this program must be placed in a single source file. Please include the following declaration by you as comment in your Python source code file (replace "Student Name" with your own name):

OPS435 Assignment 1 - Winter 2018
Program: usage_report.py
Author: "Student Name"
The python code in this file (usage_report.py) is original work written by
"Student Name". No code in this file is copied from any other source 
including any person, textbook, or on-line resource. I have not shared
this python program with anyone or anything except for submission for grading.  
I understand that the Academic Honesty Policy will be enforced and violators 
will be reported and appropriate action will be taken.

Main Menu

When your Python program is running, it should present the user with the following menus:

Reading login records... Done.

Usage Report - Main Menu
========================
d) Daily Usage Report
w) Weekly Usage Report
m) Monthly Usage Report
q) Quit

Option d, w, and m when selected will display a new sub-menu.

When option q is selected, you program should terminate.

Daily Usage Menu

• If the Daily Usage Report option is selected from the Main Menu, the following sub-menu should be presented on the screen:

Daily Usage Report Menu
=======================
u) By User
h) By Remote Host
r) Return to Main Menu

When option u is selected, the sub-menu for Daily Usage Report by User should be displayed.

When option h is selected, the sub-menu for Daily Usage Report by Remote Host should be displayed.

When option r is selected, the main menu should be displayed.

Daily Usage Report - by User
============================
...
Display list of valid user
...
r) Return to Daily Usage Report Menu

When a valid user is selected, display the Daily Usage Report for the selected user.

Valid user is regular user (super user and system users should not be included) who are allowed to login to the system.

When option r is selected, the Daily Usage Report menu should be displayed.

Daily Usage Report - by Remote Host
===================================
...
Display list of valid Remote Host
...
r) Return to Daily Usage Report Menu

When a valid Remote Host is selected, display the Daily Usage Report for the selected Remote Host.

Valid Remote Host is any host that any valid user used to login to the system.

When option r is selected, the Daily Usage Report menu should be displayed.

Weekly Usage Menu

• If the Weekly Usage Report option is selected from the Main Menu, the following sub-menu should be presented on the screen:

Weekly Usage Report Menu
========================
u) By User
h) By Remote Host
r) Return to Main Menu

When option u is selected, the sub-menu for Weekly Usage Report by User should be displayed.

When option h is selected, the sub-menu for Weekly Usage Report by Remote Host should be displayed.

When option r is selected, the main menu should be displayed.

Weekly Usage Report - by User
=============================
...
Display list of valid user
...
r) Return to Weekly Usage Report Menu

When a valid user is selected, display the Weekly Usage Report for the selected user.

When option r is selected, the Weekly Usage Report menu should be displayed.

Weekly Usage Report - by Remote Host
===================================
...
Display list of valid Remote Host
...
r) Return to Weekly Usage Report Menu

When a valid Remote Host is selected, display the Weekly Usage Report for the selected Remote Host.

When option r is selected, the Weekly Usage Report menu should be displayed.

Monthly Usage Menu

• If the Monthly Usage Report option is selected from the Main Menu, the following sub-menu should be presented on the screen:

Monthly Usage Report Menu
=========================
u) By User
h) By Remote Host
r) Return to Main Menu

When option u is selected, the sub-menu for Monthly Usage Report by User should be displayed.

When option h is selected, the sub-menu for Monthly Usage Report by Remote Host should be displayed.

When option r is selected, the main menu should be displayed.

Monthly Usage Report - by User
==============================
...
Display list of valid user
...
r) Return to Monthly Usage Report Menu

When a valid user is selected, display the Weekly Usage Report for the selected user.

When option r is selected, the Weekly Usage Report menu should be displayed.

Monthly Usage Report - by Remote Host
=====================================
...
Display list of valid Remote Host
...
r) Return to Monthly Usage Report Menu

When a valid Remote Host is selected, display the Monthly Usage Report for the selected Remote Host.

When option r is selected, the Monthly Usage Report menu should be displayed.

Submission

After fully testing your program, submit the .py file on Blackboard