1.1 Assignments this weekIndex

Check the due date for each assignment and put a reminder in your agenda, calendar, and digital assistant.

• Read All The Words, Do, and then Submit via Blackboard:
  • Assignment #03 HTML – working with files: PS1, find, mkdir, mv
  • Bonus (optional) Assignment #04 HTML – the VIM text editor
  • Assignment #05 HTML – using GLOB patterns and redirection
  • Really do Read All The Words. You don’t get a second chance to get it right.

1.2 Lab work this weekIndex

• Bonus (optional) Assignment #04 HTML is ready

• Assignment #05 HTML is ready

• Finish the above assignments, which involve work on the worksheets.

1.3 Upcoming tests and quizzesIndex

Read the Test Instructions (all the words) before your first midterm test.

1. First Midterm test: 45 minutes; in class 8am Thursday in Week 6 (February 12)
2. First Quiz is posted (based on first Practice Test).
3. Second Midterm test: 45 minutes; in class 8am Thursday in Week 9 (March 12)

Tests take place in your 8am lecture hour, not in your lab period.

3.1 Missing lectures: save one hour to spend threeIndex

Students who save an hour by not attending a lecture usually end up spending three hours trying to answer assignment questions that I gave the answers to in the lecture. Work smarter.

3.2 Fifteen minute rule – REMINDERIndex

READ THIS: This is a repeat of what I told you back in Week 3:

Your time as a student is valuable. If you come up against a tough problem and make no progress in fifteen minutes despite your best efforts:

1. get help from a professor or lab instructor
2. get help from classmates
3. take a break
4. put it on hold and work on something else

This happens to all of us, and we need to watch out for it when it happens.

Be especially careful if you find yourself trying to solve a problem with online searches, since those searches will return answers irrelevant to the assignment. Read and search the course notes; don’t waste time searching the entire Internet.

3.3 Wasting your time with online searchesIndex

I watch students trying to solve assignment problems using online searches for answers. They may end up using commands we haven’t even covered yet:

Sorry, I dont know what sudo does; was getting help online to find files.

If you look at the List of Commands You Should Know that is given in the weekly readings every week, you will see that we haven’t covered the sudo command yet, so you should not be using it. Don’t use commands that you haven’t learned yet.

Also, you must never use any command that you don’t understand, even if you get it from the course notes or a worksheet. You risk deleting all your files if you use commands you don’t understand.

If you use online help, you will find thousands of complex wrong ways to do things. If you read the course notes, not Google, you will find a simple, right way.

You only need to use the commands we’ve learned so far in the course notes and the worksheets. That is all.

3.4 Why take notes in class?Index

• Take notes in class! Your in-class notes would go here.
  • Do your class notes look like this?

A student writes:

But for the note taking, I personally find that without my laptop in front of me I am more focused on the teacher. Also with taking the notes by hand I find that the information that is presented to me in the lectures is remembered much easier.

But I do have my ipad in front of my with the class notes. This also helps me follow along with the examples that you present in class.

Also sometimes I read over the class notes after the class and fix my notes with anything that was missed.

• Does your Linux notebook look like this?

4.1 Locked out of Course Linux ServerIndex

I told you not to try to log in to the CLS with a blank userid. Now your home IP address is locked out from the CLS:

Feb  6 14:29:24 Accepted password for XXXXXXXX from 174.95.88.168
Feb  6 14:56:59 Invalid user  from 174.95.88.168
Feb  6 14:57:07 Failed password for invalid user  from 174.95.88.168
Feb  6 14:57:14 Failed password for invalid user  from 174.95.88.168
Feb  6 14:57:32 Failed password for invalid user  from 174.95.88.168
Feb  6 14:57:47 Failed password for invalid user  from 174.95.88.168
Feb  6 14:57:57 Invalid user  from 174.95.88.168
Feb  6 14:58:16 Failed password for invalid user  from 174.95.88.168
Feb  6 14:58:49 Failed password for invalid user  from 174.95.88.168
Feb  6 14:58:52 Failed password for invalid user  from 174.95.88.168
Feb  6 14:58:59 Failed password for invalid user  from 174.95.88.168
Feb  6 14:59:07 Failed password for invalid user  from 174.95.88.168
Feb  6 14:59:11 Failed password for invalid user  from 174.95.88.168
Feb  6 14:59:25 refused connect from orlnon0604w-lp130-04-2925484200.dsl.bell.ca (174.95.88.168)

Don’t do that. Here is an attack from a local Ottawa IP address:

Feb  6 21:36:58 Invalid user admin from 67.210.172.117
Feb  6 21:37:00 Failed password for invalid user admin from 67.210.172.117
Feb  6 21:39:23 Invalid user guest from 67.210.172.117
Feb  6 21:39:25 Failed password for invalid user guest from 67.210.172.117
Feb  6 21:41:48 Invalid user info from 67.210.172.117
Feb  6 21:41:50 Failed password for invalid user info from 67.210.172.117
Feb  6 21:44:14 refused connect from 67.210.172.117 (67.210.172.117)

If that’s you, you need to review your Course Linux Server login notes. I did not re-enable this IP address; you have to contact me.

4.2 Attacks on the Course Linux ServerIndex

• Count the attacks: fgrep -c "refused connect" /var/log/auth.log
• Another way to count the lines (less efficient): fgrep "refused connect" /var/log/auth.log | wc
• Only show the last 10 lines: fgrep 'refused connect' /var/log/auth.log | tail
• See the current list of evil host IPs: less /etc/hosts.evil

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Author: 
| Ian! D. Allen  -  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/