Updated: 2017-01-20 00:48 EST

1 Readings, Assignments, Labs, Tests, and ToDo

1.1 Read (at least) these things (All The Words)

  1. Week 07 Notes HTML – this file – Read All The Words
  2. Unix/Linux File System – directories, inodes, hard links
  3. Hard links and Unix/Linux file system index nodes (inodes)
  4. Unix/Linux Disk Usage, Hard Links, Quotas, Finding Inodes
  5. Symbolic Links
  6. Unix Modes and Permissions, whoami, id, groups, ls -l, chmod
  7. List of Commands You Should Know
  8. Linux and Sysadmin News in the World
  9. Video Tutorials on Lynda.com – tagged by week number

1.2 Assignments this week

Check the due date for each assignment and put a reminder in your agenda, calendar, and digital assistant. Just like in the Real World, not all due dates are on the same days or at the same times.

1.2.1 Worksheets

Worksheets are preparation for your assignments. You can’t do the assignments without having done the worksheets first, and you can’t do the worksheets without having first read the Course Notes: 1. Read. 2. Worksheet. 3. Assignment.

Form a small study group to do the worksheets. Each person tries the example given, and you make sure you all get the same answers. Worksheets are not for hand-in; they are not worth marks; the assignments test your knowledge of the lectures and worksheets.

The worksheets are available in four formats: Open Office (ODT), PDF, HTML, and Text. Only the Open Office format allows you “fill in the blanks” in the worksheet. The PDF format looks good but doesn’t allow you to type into the blanks in the worksheet. The HTML format is crude but useful for quick for viewing online.

Do NOT open the Worksheet ODT files using any Microsoft products; they will mangle the format and mis-number the questions. Use the free Libre Office or Open Office programs to open these ODT documents. On campus, you can download Libre Office here.

Worksheets prepare you for the upcoming assignments.

1.3 Lab work this week

1.4 Upcoming tests

Read the Test Instructions (all the words) before your midterm tests. Put these dates into your phone! Use the Name Game link to test your name before the test. I don’t answer questions about the instructions during the test.

  1. Second Midterm test: 45 minutes; in lecture class on Wednesday in Week 10 (Nov 9)
  2. Final Exam: 180 questions in 180 minutes in Week 15
    • Three Hours! Take a bathroom break before you start the exam.
    • Assigned Seating in T117/119 (see your email for your assigned seat)
    • Thursday December 15 11h30 (11:30am to 2:30pm) in T117/119

Tests take place in class in your 50-minute lecture period, not in your lab period. Each midterm test is 45 minutes long and contains approximately 45 multiple-choice questions similar to those found in Practice Tests and Answers.

The Final Exam is in T117/119 Thursday December 15 11h30 in Week 15. The Final Exam is three hours long. Take a washroom break before you start.

1.4.1 Midterm Test #2 – Wednesday November 9

  • Midterm #2 takes place on Wednesday, November 9 (Week 10) in your scheduled lecture hour (not in your lab period).
  • For full marks, you must read the Test Instructions before the test for important directions on how to enter your name, answers, your lab (not lecture) section number, and the test version number on the question sheet and the mark-sense forms.
  • There may be more questions on the test than you can answer in the time allowed; answer the ones you know, first.

2 Midterm Test #1 Analysis

95.6 94.6 93.3 93.3 91.1 90.2 87.1 86.7 85.8 84.4 84.4 82.2 82.2 82.2 82.2 79.2 77.8 77.8 77.8 77 75.6 73.3 73.3 73.3 73.3 72.6 71.9 71.1 71.1 71.1 71.1 70.4 69.7 68.9 68.9 68.9 68.9 68.9 66.7 66.7 66.7 66.7 66.7 66.7 66.7 66 66 66 64.4 64.4 64.4 64.4 64.4 64.4 62.2 62.2 62.2 61.6 61.6 61.6 60.4 60 59.4 58.8 58.2 57.8 57.8 57.8 57.8 55.6 55 55 54.5 53.3 53.3 51.1 51.1 51.1 51.1 51.1 50.1 48.9 48.9 48.9 48.4 46.7 46.7 46.7 46.7 44.4 44.4 44.4 44 42.2 42.2 41.8 41.8 41.4 41.4 41.4 41.4 40 40 40 40 40 39.6 39.2 39.2 37.8 37.4 37 37 36.7 36.7 35.6 35.6 35.6 35.6 35.2 34.8 33.3 33.3 33 33 32.7 32.7 31.1 31.1 30.8 30.8 30.8 30.8 28.9 28.9 28.6 28.6 26.7 26.7 26.7 26.7 26.7 26.4 26.4 26.1 26.1 24.4 24.4 24.2 24 23.7 23.7 23.7 23.5 19.8 19.8 19.6 19.6 17.8 17.8 17.8 17.4 13.3 13.2 0

165: Pass 81 (49.1%)  Fail 84 (50.9%)
 15 A ( 9.1%)     6 A-    3 A    6 A+ 
 18 B (10.9%)     7 B-    6 B    5 B+ 
 29 C (17.6%)     8 C-    9 C   12 C+ 
 19 D (11.5%)     6 D-    6 D    7 D+ 
 84 F (50.9%)    72 F-    4 F    8 F+ 
 90% - 100%   6  ******               
 80% -  90%   9  *********            
 70% -  80%  18  ******************   
 60% -  70%  29  *****************************
 50% -  60%  19  *******************  
 40% -  50%  26  **************************
 30% -  40%  26  **************************
 20% -  30%  25  *************************
 10% -  20%   6  ******               
  0% -  10%   1  *

I spent several hours correcting your errors on the mark-sense forms. Before your next test, you need to re-read the Test Instructions. Penalties go up for making Scantron errors on the next test.

3 Notes from the Classroom

3.1 Commands Used

Keep a notebook with a List of Commands in it. - You need to write down yourself what each command does. - I will check for this list in your lab periods. - Check the updated list of commands each week. - Bring your notes to class! Stop wasting time looking up commands.

3.2 Fifteen minute rule

Your time as a student is valuable. See the Week 03 Notes HTML.

4 HTTP attacks on Course Linux Server

In addition to the SSH attacks, the Course Linux Server receives attacks using bogus HTTP requests. These unsuccessful attacks below attempt to use a chain of parent directories to fetch a file out of the file system:

# zfgrep '../..' /var/log/apache2/error.log*
/var/log/apache2/error.log:[Wed Oct 19 20:49:33 2016] [error] [client 189.100.188.31] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
/var/log/apache2/error.log.1:[Sat Oct 15 06:49:57 2016] [error] [client 177.142.99.103] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
/var/log/apache2/error.log.14.gz:[Mon Jun 27 17:54:40 2016] [error] [client 222.198.128.207] Invalid URI in request GET /../../../../../../../mnt/mtd/3qS9 HTTP/1.1
/var/log/apache2/error.log.2.gz:[Fri Oct 07 09:34:11 2016] [error] [client 64.137.234.42] Invalid URI in request GET /../../../../../../../mnt/mtd/ahMk HTTP/1.1
/var/log/apache2/error.log.22.gz:[Mon May 02 12:21:45 2016] [error] [client 222.235.67.147] Invalid URI in request GET /../../../../../../../mnt/mtd/IJSj HTTP/1.1
/var/log/apache2/error.log.23.gz:[Tue Apr 26 17:09:59 2016] [error] [client 67.79.37.250] Invalid URI in request GET /../../../../../../../mnt/mtd/yqcP HTTP/1.1
/var/log/apache2/error.log.42.gz:[Sun Dec 13 13:50:57 2015] [error] [client 54.201.251.33] Invalid URI in request GET /../../ratings.html HTTP/1.1
/var/log/apache2/error.log.42.gz:[Sun Dec 13 13:51:01 2015] [error] [client 54.201.251.33] Invalid URI in request GET /../../index.html HTTP/1.1
Take Notes in Class

Take Notes in Class

Author: 
| Ian! D. Allen, BA, MMath  -  idallen@idallen.ca  -  Ottawa, Ontario, Canada
| Home Page: http://idallen.com/   Contact Improv: http://contactimprov.ca/
| College professor (Free/Libre GNU+Linux) at: http://teaching.idallen.com/
| Defend digital freedom:  http://eff.org/  and have fun:  http://fools.ca/

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