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:
  • Bonus (optional) Assignment #04 HTML – the VIM text editor
  • Assignment #05 HTML – using GLOB patterns and redirection
  • Bonus (optional) Assignment #06 HTML – Midterm #1 corrections
  • Assignment #07 HTML – start-up files, environment, search PATH, quoting, hard and soft links, disk usage
  • 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 about VIM has a new due date
• Assignment #05 HTML was due this week
• Bonus (optional) Assignment #06 HTML about Midterm #1 is ready
• Assignment #07 HTML is ready (start-up files, environment, search PATH, quoting, hard and soft links, disk usage)
• Work on the above assignments in your lab period; ask questions.

1.3 Upcoming tests and quizzesIndex

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

1. Second Midterm test: 45 minutes; in class 8am Thursday in Week 9 (March 12)
   • Midterm Tests take place in your 8am lecture hour, not in your lab period.
2. Final Exam: 180 minutes; Tuesday April 21 11am to 2pm in room C144
   • Take a bathroom break before you sit down for three hours!

1.4 Midterm Test #1 Analysis (secondary)Index

100/107 people. Two students still haven’t filled out their mark-sense form correctly so that I can send it to be marked.

• Number of students (out of 100) who did not fill in the mark-sense form correctly so that I could mark it: 32

• Number of students (out of 100) who entered their own name incorrectly on the mark-sense form (usually by shortening it): 9

• Number of students who got question #45 wrong even though the answer was given in the Test Instructions printed at the top of the test: 12 (Number who copied the same answer as on the practice test: 6)

• Class scores for 100 (out of 107 registered) students:

100 100 97.8 97.8 95.6 95.6 95.6 95.6 93.3 93.3 93.3 93.3 91.1 90.5 88.9 88.4 86.7 86.7 86.2 86.2 84.4 84.4 82.2 80 80 80 79.8 77.8 77.8 77.6 77.6 75.6 75.4 75.4 75.4 73.3 73.3 73.3 73.3 73.3 73.3 71.1 71.1 71.1 69 66.7 64.7 64.4 62.5 62.2 62.2 62.2 62.2 62.2 57.8 55.6 55.6 53.9 53.9 53.9 53.3 53.3 51.7 51.1 51.1 49.6 48.9 48.1 47.4 46.7 44.4 44.4 43.1 42.2 42.2 38.8 37.8 37.8 36.6 36.6 35.6 35.6 35.6 33.3 33.3 32.3 31.1 30.2 29.3 28.9 28 28 27.2 26.7 26.7 24.4 22.2 22.2 19.4 -00 -00

98: Pass 66 (67.3%)  Fail 32 (32.7%)
 27 A (27.6%)     7 A-    6 A   14 A+ 
 17 B (17.3%)     3 B-   10 B    4 B+ 
 10 C (10.2%)     5 C-    3 C    2 C+ 
 12 D (12.2%)     4 D-    7 D    1 D+ 
 32 F (32.7%)    25 F-    3 F    4 F+ 
 90% - 100%  14  **************       
 80% -  90%  13  *************        
 70% -  80%  17  *****************    
 60% -  70%  10  **********           
 50% -  60%  12  ************         
 40% -  50%   9  *********            
 30% -  40%  12  ************         
 20% -  30%  10  **********           
 10% -  20%   1  *                    
  0% -  10%   0

• You can see the errors in Midterm Test #1 PDF.

4.1 Linux System Administrator – well paidIndex

http://www.itworld.com/article/2872827/linux-system-administrators-make-big-bucks.html

• “Become a Linux system administrator and rake in the cash.”
• “The Linux job market has been hot for a while, and system administrators make top dollar.”

4.2 Linux System Administrator – bilingual – MontrealIndex

http://www.bullhornreach.com/job/1896133_system-administrator-bilingual-montreal-qc-canada

Responsibilities: Perform all the work related to a System Admin, such as :

• Configure client’s environment;
• Support daily operation of client’s environment et fulfill his needs ;
• Provide support to production and migration environments.

Required Knowledge :

• Strong know-how in Virtualization, Linux , VMWare, Apache, lighthttpd, NFS;
• Experience as Linux administrator;
• Experience with CHEF and GIT. (required) ;
• Bilingual preferred, otherwise French
• Able to work under pressure;
• Being client oriented
• Team player.

Required Skills & Abilities

• Linux (CentOS / Ubuntu)
• Apache
• CHEF
• GIT
• VMWare
• NFS

Required Experience :

• 7 to 12 years as Linux administrator

4.3 Locked out of Course Linux Server #1Index

A student sends me email, knowing he has locked himself out of the CLS using WinSCP. He doesn’t understand why his password has stopped working. The student is not following the rules for asking good questions, which require you to tell me exactly what userid and host name you are using when you report a problem. I ask what userid and host name the student used in WinSCP. The student then tells me what his userid is. I say that I know what his userid is; he doesn’t need to tell me that. What he does need to tell me is actually what settings he used in WinSCP. Only then does the student check WinSCP and realize that he is using a blank userid:

Feb  9 21:21:13  Accepted password for XXXXXXXX from 99.241.61.183
Feb  9 22:03:27  Invalid user  from 99.241.61.183
Feb  9 22:03:37  Failed password for invalid user  from 99.241.61.183
Feb  9 22:03:45  Failed password for invalid user  from 99.241.61.183
Feb  9 22:04:09  Invalid user  from 99.241.61.183
Feb  9 22:04:21  Failed password for invalid user  from 99.241.61.183
Feb  9 22:04:29  Failed password for invalid user  from 99.241.61.183
Feb  9 22:04:49  Failed password for invalid user  from 99.241.61.183

Linux people! In Week 1 as part of using the CLS I told you How to ask good questions and report problems well. When you report a problem, don’t send me what you think you typed, send me what you really typed.

4.4 Locked out of Course Linux Server #2Index

Another student locked out at home (Rogers) by using a blank userid:

Feb  9 11:55:40 Accepted password for XXXXXXXX from 99.246.116.39
Feb 12 20:29:34 Invalid user  from 99.246.116.39
Feb 12 20:29:42 Failed password for invalid user  from 99.246.116.39
Feb 12 20:29:50 Failed password for invalid user  from 99.246.116.39
Feb 12 20:32:52 Invalid user  from 99.246.116.39
Feb 12 20:33:07 Failed password for invalid user  from 99.246.116.39
Feb 12 20:33:20 Failed password for invalid user  from 99.246.116.39
Feb 12 20:34:14 refused connect from cpebc1401e66f13-cmbc1401e66f10.cpe.net.cable.rogers.com (99.246.116.39)

Check your userid before you use WinSCP!

4.5 Locked out of Course Linux Server #3Index

Another student locked out at home (Rogers) by using first an invalid userid and then a blank userid:

Feb 22 23:49:24 Accepted password for XXXXXXXX from 99.245.232.208
Feb 23 22:40:22 Invalid user XXXXXXXX from 99.245.232.208
Feb 23 22:44:13 Invalid user  from 99.245.232.208
Feb 23 22:44:21 Failed password for invalid user  from 99.245.232.208
Feb 23 22:45:10 Failed password for invalid user  from 99.245.232.208
Feb 23 22:45:20 Invalid user  from 99.245.232.208
Feb 23 22:45:28 Failed password for invalid user  from 99.245.232.208
Feb 23 22:45:34 Failed password for invalid user  from 99.245.232.208
Feb 23 22:46:35 refused connect from cpe84948c505b11-cm84948c505b10.cpe.net.cable.rogers.com (99.245.232.208)

Check your typing, and make sure you have a userid before you use WinSCP!

4.6 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

4.7 Reading text on paper to minimize distractionsIndex

The case against E-readers (from Slashdot)

Michael Rosenwald writes in the WaPo that textbook makers, bookstore owners and college student surveys all say millennials still strongly prefer reading on paper for pleasure and learning. This bias surprises reading experts, given the same group’s proclivity to consume most other content digitally. “These are people who aren’t supposed to remember what it’s like to even smell books,” says Naomi S. Baron. “It’s quite astounding.” Earlier this month, Baron published Words Onscreen: The Fate of Reading in a Digital World, a book that examines university students’ preferences for print and explains the science of why dead-tree versions are often superior to digital (PDF).

Her conclusion: readers tend to skim on screens, distraction is inevitable and comprehension suffers. Researchers say readers remember the location of information simply by page and text layout — that, say, the key piece of dialogue was on that page early in the book with that one long paragraph and a smudge on the corner. Researchers think this plays a key role in comprehension — something that is more difficult on screens, primarily because the time we devote to reading online is usually spent scanning and skimming, with few places (or little time) for mental markers.

Another significant problem, especially for college students, is distraction. The lives of millennials are increasingly lived on screens. In her surveys, Baron was surprised by the results to the question of whether students were more likely to multitask in hard copy (1 percent) vs. reading on-screen (90 percent). “When a digital device has an Internet connection, it’s hard to resist the temptation to jump ship.”

Take Notes in Class