Each student will work independently on several tasks. This assignment will demonstrate the student's ability to:

Transcription

1 ULI101 Assignment 2 - Summer 2009 Due: Saturday, August 8, 2009, Midnight Worth: 10% of final mark Each student will work independently on several tasks. This assignment will demonstrate the student's ability to: 1. Create and run a shell script (a2.scr) that does the following: Use hard and soft links which allow users to access files using different paths and filenames for the same file. Use the grep command (Global Regular Expression Print) to investigate file contents and display selective lines of text files. Use piping and redirection to execute powerful combinations of commands thereby accomplishing tasks that no single command is able to produce. 2. Create a simple web page containing some of the answers to this assignment Integrating Different Applications: All_In_One Introduction: Abacus College supports three Learning Management Systems (LMS). Their Information Technology Support Center (ITS Center) supports BLACKBOARD, Moodle and ANGEL. In their support effort the ITS Center found that all three have some identical files, however the path and file name is different depending on whether a user is using BLACKBOARD, Moodle or ANGEL. Interestingly, Abacus College also has a MATRIX server just like Seneca College. The three systems will be installed on the MATRIX server. Login to your home directory on matrix. Write a shell script to create a new directory called a2dir, in which the following 4 directories will be created: The paths and file names are in Table 1 below. Assume your home dir is /home/user (user=your login name) All_In_One BLACKBOARD Moodle ANGEL STUDENT /home/user/a2dir/bb/student /home/user/a2dir/mood/files/stud /home/user/a2dir/angel/stud COURSE /home/user/a2dir/bb/course /home/user/a2dir/mood/files/crse /home/user/a2dir/angel/crse GRADES /home/user/a2dir//bb/grades /home/user/mood/files/marks /home/user/a2dir/angel/results Table 1: File Names For Common Files in BLACKBOARD, Moodle and ANGEL

2 You are the LINUX administrator and you must set up the files and links so that a user can use BLACKBOARD, Moodle or ANGEL by sharing these files. You decide to put the STUDENT, COURSE AND GRADES files in the /home/user/a2dir/all_in_one directory. The other directories need to share the files that exist in All_In_One directory. However, you don t want to make copies of the files, but rather, you want to create links to those files to allow access to them General instructions: 1. You will create a shell script a2.scr, which contains all commands. You will run the script to make sure they work. You will the script file to the teacher, using the appropriate mail command in Linux. You may be asked to demonstrate the script in the lab. 2. Marks will be deducted if you don't specify your correct section letter in the subject line of your submission message. 3. Marks will be deducted if your URL does not activate when your professor clicks on the URL in your submission message. 4. Your professor may have alternate submission instructions. You are responsible for knowing how to submit the assignment for your section. You may lose marks if you don't submit the assignment in the required way.

3 Detailed Instructions For Each Step: A. STEP #0 (Webpage) First create a sub-directory nnnnn in your public_html directory, where nnnnn represents the last five digits of your Student Id. In this subdirectory create a hard link to your any of the previous xhtml webpages you have created and validated in previous labs or assignment.(call the hard link first_hlink.html), create a soft link to first_hlink.html (call the soft link first_slink.html), and create an html file (call the html file assignment2.html). The html page will meet the following specifications: 1. The web page will have a table with one column and 4 rows. 1. the first cell will contain "ULI101-A2-Section " without the quotes (replace with your section letter) 2. the next cell will contain your name 3. the next cell will contain a hypertext link to your hard link first_hlink.html and the link text will be first hard link (without the quotes) 4. the next cell will contain a hypertext link to your soft link first_slink.html and the link text will be first soft link (without the quotes) 2. When you click on either of the above hyperlinks you should see the main page of your validated xhtml page from an assignment or a lab. 3. Your page must be valid and display the W3C icon indicating successful validation. 4. You must make sure your home directory, your public_html directory and your public_html/nnnnn directory have following permissions for others (e.g. drwx-----x), i.e. 701, and no permissions for group. This will help to prevent unauthorized access to your assignment files. Do not share your student ID or location of your assignment files with other students. Go into your login home directory on matrix. Then go into a2dir to do the following commands: B. STEP #1 (Links) 1. Write a Linux command to remove the All_In_One directory and all of its contents (in case it already exists). LINUX would send any errors to the monitor by default. Trap any error messages so that they will not be displayed on the monitor, instead sending them to the file /dev/null 2. After the All_In_One directory and any contents have been removed (in the previous command), write a Linux command to create the All_In_One directory. 3. Write a Linux command to create 3 empty text files named STUDENT, COURSE and GRADES text files in the All_In_One directory. Then create 3 directories: BLACKBOARD MODDLE ANGEL. 4. Write a series of Linux commands to create hard links that will allow BLACKBOARD, Moodle or ANGEL users to use the STUDENT, COURSE AND GRADES text files found in the All_In_One directory.

4 Continue to put the following commands into your script file. Run the script to make sure it works. All this is happening in a2dir directory inside your home directory: C. STEP #2-A. (First Merge task) Answers On December 31 st of every year we copy the STUDENT file to STUDENTnnnn (for example: on December 31 st, 2006, we created a backup of STUDENT called STUDENT2006). We did the same for COURSE and GRADES. So we obtained three new files: STUDENT2006, COURSE2006 AND GRADES2006. These files are kept in the /home/user/a2dir/all_in_one directory. Write the commands necessary to send the contents of STUDENT2007, STUDENT2008 to the monitor. If there are any error messages, they should be sent to file /home/user/a2dir/all_in_one/stud_errors. D. STEP #2-B. (Second Merge task) Answers Write the commands necessary to send the contents of GRADES2007 and GRADES2008 to /home/user/a2dir/all_in_one/grades78 and append any error messages to a file called home/all_in_one/grades_errors. E. STEP #2-C. (Third Merge task) Answers Write the commands necessary to send the contents of the COURSE2007 AND COURSE2008 files to /home/users/a2dir/all_in_one/course78. Using pipes or redirection, the commands also sort any errors and append them to a file called /home/user/a2dir/all_in_one/course_errors. Hint: You can use a temporary file, and more than one command. F. STEP #3-A. (First Search of Errors file) Answers The ITS Center changes its policies and starts collecting all errors in one file /home/user/a2dir/all_in_one/all_errors. Write the commands necessary to examine the file /home/user/a2dir/all_in_one/all_errors and display to the monitor only the errors concerning missing files or directories (Hint: look for "no such "). We want the results to be sorted and displayed one page at a time. G. STEP #3-B. (Second Search of Errors file) Answers Write the Linux commands necessary to examine /home/user/a2dir/all_in_one/all_errors and display to the monitor only the lines that have the word "missing" and the word "directory" and the word home in that order, somewhere in the line. Hint 1: You can use piping more than once in the same line. Hint 2: You may also want to use redirection as well as piping to accomplish this requirement. Hint 3: Try testing your command by inserting data into a file and ensuring that the script works correctly by inspecting the output.

5 Assignment 2 submission template NOTE: follow the submission instructions here unless otherwise instructed by your professor Using the subject ULI101-A2-Section (replacing with your section letter, in upper case), send an to your professor from your learn account. The that you send should contain the following items in that order: 1. Link to the webpage you have created for this assignment 2. Copy and paste your script into the body of this 3. Type the following text at the bottom: I declare that this attached assignment is my/our own work in accordance with the Seneca Academic Policy. No part of this assignment has been copied manually or electronically from any other source (including web sites) or distributed to other students Name & Student ID