Updated: 2017-10-10 13:59 EDT

1 Readings, Assignments, Labs, Tests, and ToDoIndexup to index

1.1 Read (at least) these things (All The Words)Indexup to index

  1. Week 05 Notes HTML – this file – Read All The Words
  2. Selecting Fields with awk – extracting fields from input lines and columns from input files
  3. Shell Variables – quoting, local and environment variables, USER HOME SHELL PATH TERM $$
  4. Start-Up Files – Login and Shell Startup Files, aliases, options: .bash_profile and .bashrc
  5. Practice Tests and Answers – practice questions for your midterm test.
  6. List of Commands You Should Know
  7. Video Tutorials on Lynda.com – tagged by week number
  8. Linux and Sysadmin News in the World

1.2 Assignments this weekIndexup to index

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.

1.3 Lab work this weekIndexup to index

1.3.1 WorksheetsIndexup to index

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. Worksheets. 3. Assignment.

Make notes from the worksheets on how each command works. What do the options used in the worksheets mean, for each command? (See the weekly Command List.)

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.

These first two worksheets require you to have read File System and Pathnames:

Worksheets prepare you for the upcoming assignments.

1.4 Upcoming tests and examsIndexup to index

This course has two midterm tests (10%, 15%) and one final exam (40%).

Bring your favourite marker to your test

Bring your favourite marker to your test

Note that your upcoming Midterm Test #1 is worth more than three assignments put together. Don’t spend all your time doing an assignment at the expense of studying the Practice Tests and Answers for the Midterm Test.

  1. First Midterm test: 45 minutes; in your one-hour lecture class on Thursday or Friday in Week 5 (October 5 or 6).
  2. Second Midterm test: 45 minutes; in your one-hour lecture class on Thursday or Friday in Week 9 (November 2 or 3).

Tests take place in your 50-minute lecture class, 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. You must write the test in the lecture class in which you are registered.

Your first midterm test takes place this week.

See the Week 04 Notes HTML for all the test and quiz information.

2 Notes from the ClassroomIndexup to index

2.1 Draw file system diagramsIndexup to index

See last week’s note about drawing file system diagrams: Week 03 Notes HTML

2.2 Commands UsedIndexup to index

Keep a notebook with a List of Commands in it.

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

3 TutoringIndexup to index

Many students find that hiring a personal tutor helps them get through the first term. Financial assistance is available. See the Tutoring heading in the Course Introduction.

4 SSH Attacks on the CLSIndexup to index

You are not paranoid if they really are out to get you! See the Week 03 Notes HTML for command pipelines to count the attacks on the CLS.

4.1 HTTP attacks on Course Linux ServerIndexup to index

In addition to the SSH attacks, machines on the Internet receive 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:

[Dec 13 13:50:57 2015] [client 54.201.251.33] Invalid URI in request GET /../../ratings.html HTTP/1.1
[Dec 13 13:51:01 2015] [client 54.201.251.33] Invalid URI in request GET /../../index.html HTTP/1.1
[Apr 26 17:09:59 2016] [client 67.79.37.250] Invalid URI in request GET /../../../../../../../mnt/mtd/yqcP HTTP/1.1
[May 02 12:21:45 2016] [client 222.235.67.147] Invalid URI in request GET /../../../../../../../mnt/mtd/IJSj HTTP/1.1
[Jun 27 17:54:40 2016] [client 222.198.128.207] Invalid URI in request GET /../../../../../../../mnt/mtd/3qS9 HTTP/1.1
[Oct 07 09:34:11 2016] [client 64.137.234.42] Invalid URI in request GET /../../../../../../../mnt/mtd/ahMk HTTP/1.1
[Oct 15 06:49:57 2016] [client 177.142.99.103] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
[Oct 19 20:49:33 2016] [client 189.100.188.31] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
[Oct 23 00:43:39 2016] [client 191.189.55.9] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
[Nov 02 21:35:09 2016] [client 201.37.223.72] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
[Jan 07 20:51:33 2017] [client 201.17.154.181] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0
[May 10 21:22:29 2017] [client 187.67.167.31] Invalid URI in request GET /../../../../../../../mnt/mtd/qt HTTP/1.0

The Apache server blocked all the above attacks.

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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