1.1 Midterm Test #1 and QuizIndex

• Midterm #1 takes place Wednesday, February 12 in your lecture.
• See the Week 04 Notes HTML for details about the test and the quiz.

1.2 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 #02 HTML – simple file system commands on the CLS
  • Assignment #04 HTML – simple commands, copy, GLOB and redirection
  • Really do Read All The Words. You don’t get a second chance to get it right.

1.3 Lab work this weekIndex

The worksheets are available in four formats: Open Office, 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.

• Worksheet #02 HTML – Using standard Linux commands I
  • PS1, cd, find, less, ls, man, mkdir, passwd, pwd, rmdir
• Worksheet #03 HTML – Using standard Linux commands II
  • cat, clear, cp, find, grep, history, less, man, mv, rm, sleep, touch
• Worksheet #04 HTML – GLOB Patterns and Aliases
  • bash GLOB patterns, alias, sum
• Worksheet #05 HTML – I/O Redirection and Pipes
  • I/O redirection and pipes, date, head, nl, tail, tr, wc

3.1 Scanning the Log FileIndex

Here are command pipelines that extract information from the system authorization log file /var/log/auth.log on who is trying to attack the Course Linux Server (may require privileged read permission on the log files). I worked these examples in class this week:

• Failed passwords (since the log began):

• The userid field is the 9th blank-separated field on each of these lines in /var/log/auth.log:

  Jan  2 09:51:17 idallen-ubuntu sshd[28008]: Failed password for root from 50.46.204.2 port 33092 ssh2
  
  fgrep 'Failed password' /var/log/auth.log \
      | awk '{print $9}' | sort | uniq -c | sort -r | head

• Failed passwords only in January:

• Add a second fgrep to further limit the lines to ones that contain the string Jan followed by a blank:

  fgrep 'Failed password' /var/log/auth.log \
      | fgrep 'Jan ' \
      | awk '{print $9}' | sort | uniq -c | sort -r | head

• Failed passwords only in February:

• Just change Jan to Feb in the search string:

  fgrep 'Failed password' /var/log/auth.log \
      | fgrep 'Feb ' \
      | awk '{print $9}' | sort | uniq -c | sort -r | head

• Connections refused only in February:
• Just change Failed password to refused connect in the search string.

• The IP address is also the 9th field on each of these lines in /var/log/auth.log:

  Jan  2 02:18:27 idallen-ubuntu sshd[18078]: refused connect from 222.189.239.75 (222.189.239.75)
  
  fgrep 'refused connect' /var/log/auth.log \
      | fgrep 'Feb ' \
      | awk '{print $9}' | sort | uniq -c | sort -r | head

4.1 EC recommends supporting open document formatIndex

• https://joinup.ec.europa.eu/community/osor/news/ec-recommends-supporting-open-document-format

  All European institutes should be able to use the Open Document Format (ODF) in exchanges with citizens and national administrations, says Vice-President of the European Commission Maroš Šefčovič, in response to questions by member of the European Parliament Amelia Andersdotter. There is no lock-in effect whatsoever, and no contradiction with the Commission’s strategy on interoperability.

Take Notes in Class