% CST8207 Week 08 Notes -- Disk usage, quotas, finding inodes, symbolic links, modes, permissions, chmod % Ian! D. Allen -- -- [www.idallen.com] % Fall 2015 - September to December 2015 - Updated 2015-11-03 03:18 EST - [Course Home Page] - [Course Outline] - [All Weeks] - [Plain Text] Readings, Assignments, Labs, Tests, and ToDo ============================================ Read (at least) these things (All The Words) -------------------------------------------- 1. [Week 08 Notes HTML] -- this file -- **Read All The Words** 2. [Hard links and Unix/Linux file system index nodes (inodes)] 3. [Unix/Linux Disk Usage, Hard Links, Quotas, Finding Inodes] 4. [Symbolic Links] 5. [Unix Modes and Permissions, whoami, id, groups, ls -l, chmod] 6. [Linux and Sysadmin News in the World] 7. [List of Commands You Should Know] -- keep a notebook! 8. [Video Tutorials on Lynda.com] -- tagged by week number ![CST8207 Command Notebook] - Create your [lynda.com] account and watch these sections of [Unix for Mac OS X Users] - **3. Working with Files and Directories** - Hard links 5m 30s - Symbolic links 6m 36s - **4. Ownership and Permissions 34m 58s** - Who am I? 4m 3s - `whoami` - Unix groups 1m 52s - `groups` - File and directory ownership 6m 41s - `ls -la` - File and directory permissions 4m 27s - `rwx` notation - **5. Commands and Programs** - Disk information commands 6m 8s - df, du, Assignments this week --------------------- 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] about Midterm #1 is ready - There will be a checking program available to check your file format for this bonus assignment, but only people who Read All These Words will know about it. Wrong format means no marks. - [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. ### Worksheets 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 teach you how commands work. Worksheets are not for hand-in; they are not worth marks. > 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 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]. - [Worksheet #02 ODT] -- Using standard Linux commands I - [Worksheet #02 PDF] - [Worksheet #02 HTML] - `PS1, cd, find, less, ls, man, mkdir, passwd, pwd, rmdir` - [Worksheet #03 ODT] -- Using standard Linux commands II - [Worksheet #03 PDF] - [Worksheet #03 HTML] - `cat, clear, cp, find, grep, history, less, man, mv, rm, sleep, touch` - [Worksheet #04 ODT] -- shell GLOB patterns and Aliases - [Worksheet #04 PDF] - [Worksheet #04 HTML] - shell GLOB patterns (wildcards), Aliases: `alias, sum, unalias` - [Worksheet #05 ODT] -- shell I/O redirection (including pipes) - [Worksheet #05 PDF] - [Worksheet #05 HTML] - shell I/O redirection, `date, head, nl, tail, tr, wc` - [Worksheet #06 HTML] -- *Optional* Bonus VIM Text Editor Practice - This is an *optional* worksheet for a BONUS assignment using `vim` - Optional command-line VIM tutorial: the `vimtutor` program on the CLS. - Bonus (optional) [Assignment #04 HTML] -- the VIM text editor - Read [The VI (VIM) Text Editor] Lab work this week ------------------ - Read [The VI (VIM) Text Editor] and optionally do the bonus [Assignment #04 HTML]. - For Assignment 5 do [Worksheet #04 PDF] -- shell GLOB patterns and Aliases - Do [Assignment #05 HTML] -- using GLOB patterns and redirection - Do Bonus (optional) [Assignment #06 HTML] about Midterm #1 - There will be a checking program available to check your file format for this bonus assignment, but only people who Read All These Words will know about it. Wrong format means no marks. - [Assignment #07 HTML] -- start-up files, environment, search PATH, quoting, hard and soft links, disk usage Upcoming tests -------------- Read the [Test Instructions] (all the words) before all your tests and exams. - Second Midterm test: 45 minutes; in lecture class Friday in Week 9 (Nov 6) - Final Exam: 8am to 11am (three hours) on December 19 in two rooms T117/T119 - Three Hours! Take a bathroom break before you start the exam. Midterm tests take place in class during your usual one-hour lecture hour, not in your lab period. The Final Exam is in the room noted above. ### Midterm Test #2 -- November 6 - Midterm #2 takes place on Friday, November 6 (Week 9) in your scheduled lecture hour (not in your lab period). - For full marks, you must read the [Test Instructions] before the test for important directions on how to enter your answers, your lab (not lecture) section number, and the test version number on the question sheet and the mark-sense forms. - There may be more questions on the test than you can answer in the time allowed; answer the ones you know, first. - A set of practice questions and answers for the second midterm test is posted: [Practice Tests and Answers]. ### Quizzes: Midterm #2 Quiz - Blackboard has some quizzes taken randomly from the practice test. This second quiz set is one of several marked quizzes in this course. - See a previous week for the details on how quizzes are marked. - See the [Course Outline] for the mark weight of all the quizzes. From the Class Notes link on the Course Home Page ================================================= - [Course Home Page] - [All Weeks] - Review last week. Did you do everything assigned last week? From the Classroom Whiteboard/Chalkboard ======================================== - **Take notes in class!** Your in-class notes would go here. - Are you making notes from the worksheets on how each command works? - What do the options used in the worksheets mean, for each command? - Don't copy and use options that you don't understand! - Bring your notes to class! Stop wasting time looking up commands. Attacks on the Course Linux Server ---------------------------------- - 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` - See the current list of *evil* host IPs: `less /etc/hosts.evil` Locked out again ================ Don't do this: Oct 23 15:56:08 Invalid user .2$ from 99.224.164.198 Oct 23 15:56:14 Failed password for invalid user .2$ from 99.224.164.198 Oct 23 15:56:36 refused connect from cpe00fc8d22a843-cm00fc8d22a840.cpe.net.cable.rogers.com (99.224.164.198) Or this: Oct 25 23:20:32 Invalid user sa0169 from 99.224.164.198 Oct 25 23:20:43 Failed password for invalid user sa0169 from 99.224.164.198 Oct 25 23:21:05 refused connect from cpe00fc8d22a843-cm00fc8d22a840.cpe.net.cable.rogers.com (99.224.164.198) ![Read All The Words] -- | 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/ [Plain Text] - plain text version of this page in [Pandoc Markdown] format [www.idallen.com]: http://www.idallen.com/ [Course Home Page]: .. [Course Outline]: course_outline.pdf [All Weeks]: indexcgi.cgi [Plain Text]: week08notes.txt [Week 08 Notes HTML]: week08notes.html [Hard links and Unix/Linux file system index nodes (inodes)]: 455_links_and_inodes.html [Unix/Linux Disk Usage, Hard Links, Quotas, Finding Inodes]: 457_disk_usage.html [Symbolic Links]: 460_symbolic_links.html [Unix Modes and Permissions, whoami, id, groups, ls -l, chmod]: 500_permissions.html [Linux and Sysadmin News in the World]: 950_linux_world.html [List of Commands You Should Know]: 900_unix_command_list.html [Video Tutorials on Lynda.com]: 910_lynda_index.html [CST8207 Command Notebook]: data/cv_notebook.jpg "CST8207 Command Notebook" [lynda.com]: http://algonquincollege.com/onlineresources/mobileStudent/lynda.htm [Unix for Mac OS X Users]: http://www.lynda.com/Mac-OS-X-10-6-tutorials/Unix-for-Mac-OS-X-Users/78546-2.html [Assignment #04 HTML]: assignment04.html [Assignment #05 HTML]: assignment05.html [Assignment #06 HTML]: assignment06.html [Assignment #07 HTML]: assignment07.html [download Libre Office here]: 050_course_introduction.html#install-libreoffice-or-openoffice-into-windows [Worksheet #02 ODT]: worksheet02.odt [Worksheet #02 PDF]: worksheet02.pdf [Worksheet #02 HTML]: worksheet02.html [Worksheet #03 ODT]: worksheet03.odt [Worksheet #03 PDF]: worksheet03.pdf [Worksheet #03 HTML]: worksheet03.html [Worksheet #04 ODT]: worksheet04.odt [Worksheet #04 PDF]: worksheet04.pdf [Worksheet #04 HTML]: worksheet04.html [Worksheet #05 ODT]: worksheet05.odt [Worksheet #05 PDF]: worksheet05.pdf [Worksheet #05 HTML]: worksheet05.html [Worksheet #06 HTML]: worksheet06.html [The VI (VIM) Text Editor]: 300_vi_text_editor.html [Test Instructions]: 000_test_instructions.html [Practice Tests and Answers]: PRACTICE_TEST_README.html [Read All The Words]: ian_algonquin2014_read_all_the_words.jpg "Read All The Words" [Pandoc Markdown]: http://johnmacfarlane.net/pandoc/