Updated: 2018-02-09 03:29 EST

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

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

  1. Week 04 Notes HTML – this file – Read All The Words
  2. Shell GLOB patterns – wildcard pattern matching of pathnames
  3. Shell I/O Redirection – stdin, stdout, stderr, and Pipes
  4. Practice Tests and Answers – practice questions for your midterm test.
  5. List of Commands – Command names you should know, listed by week
  6. Video Tutorials on Lynda.com – tagged by week number
  7. Linux and Sysadmin News in the World

1.2 Assignments this weekIndexup to index

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.

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

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.

1.3.1 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 List of Commands.)

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 get a copy here: Course Introduction: Install Libre Office.

Worksheets #02 and #03 require you to have read File System and Pathnames:

Worksheets #04 and #05 require you to have read Shell GLOB patterns and Shell I/O Redirection:

Worksheet #06 is for the optional VIM Bonus Assignment (extra credit):

Worksheets prepare you for the upcoming assignments.

1.4 Upcoming testsIndexup to index

See the Week 03 Notes HTML for details on the upcoming tests.

1.4.1 Midterm Test #1 – Wednesday February 14 at 3pm in C346Indexup to index

Midterm Test #1 updated February 7 to exclude GLOB and I/O redirection

See the Week 03 Notes HTML for details.

1.4.2 Practice Test #1 and Blackboard Quiz #1Indexup to index

Practice Test #1 and Blackboard Quiz #1 updated February 7 to exclude GLOB and I/O redirection

See the Week 03 Notes HTML for details.

2 Notes from the ClassroomIndexup to index

2.1 Simplifying pathnamesIndexup to index

Rewrite each pathname as a simplified absolute pathname:

  1. /home/me/../you/../../etc/../home/me/../you/../me/../foo
  2. /home/me/../you/../../etc/../home/me/../you/../me/../..
  3. /usr/./bin/../lib/../../etc/../usr/./lib/../bin/./bar
  4. /usr/./bin/../lib/../../etc/../usr/./lib/../bin/..
  5. /../../var/./a/../../var/b/../../etc/./bar/../foo
  6. /../../var/./a/../../var/b/../../etc/./bar/..

These questions and the answers are part of Practice Test #1 in Practice Tests and Answers. Look for questions starting with “Simplify this pathname”.

2.2 Draw file system diagramsIndexup to index

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

2.3 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.

3.1 Network and Linux Tutor Available on Saturday morningsIndexup to index

From: Charles Nixon
Subject: Saturday Open Labs
Date: Monday, January 29, 2018 2:36 PM

Starting this Sat Feb 03 from 9am-12pm rooms T113, T114 and T111
will be opened for students to use.

A tutor (Julie Labadie 4^th semester CST) will be supervising and
available for drop in tutoring.

The Linksys SOHO routers from T111 will be signed out from Julie in T113.

Please share this with your students, the hallway schedules have
been updated with the open lab times.

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.

5 Locked out of the CLSIndexup to index

When you are locked out, follow the directions in the notes to get your IP address re-enabled.

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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