1 Readings, Assignments, Labs, and ToDo

Read (at least) these things (All The Words):
- Week 07 Notes HTML – this file – Read All The Words
- Unix/Linux File System - directories, inodes, etc.
- Hard links and Unix/Linux file system index nodes (inodes)
- Hard links and Unix file system nodes (inodes)
- Unix/Linux Disk Usage, Hard Links, Finding Inodes
- List of Commands You Should Know
- Video Tutorials on Lynda.com
Using your lynda.com account, watch Unix for Mac OS X Users
- 3. Working with Files and Directories
  - Hard links 5m 30s
  - Symbolic links 6m 36s
- 5. Commands and Programs
  - Disk information commands 6m 8s
    - df, du,

1.1 Midterm Test #2

All test and exam dates are posted on the Course Home Page.
Midterm #2 takes place Friday, October 31 in your one-hour lecture.
You must read the Test Instructions first.
213 practice Midterm Test #1 questions are available along with an answer key in the Class Notes. See the Practice Test README page.
A Quiz on most of these questions is available on Blackboard. See the Week 04 Notes HTML for how quizzes work.
Midterm Test #2 covers:
- anything on the previous midterm test, especially questions that were not answered correctly, plus:
- weekly notes, labs, quizzes, and assignments for Weeks 1 through 8 inclusive.
- The emphasis is on material covered since the previous test.
- Material in Assignment #04 HTML is relevant to this test.
- Material in Assignment #06 HTML is relevant to this test.

1.2 Final Exam 8am Monday December 8

The final exam schedule is posted on the Course Home Page. Your final exam is three hours long, starting at 8am, in T117/119. It will be 180 multiple-choice questions. There will be a set of practice questions, and a quiz on those questions, posted before the exam.

1.3 Assignments and Lab work 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:
- Assignment #04 HTML – Start-Up, GLOB, redirection, environment
- Assignment #06 HTML – quoting, search PATH, disk usage, hard and soft links
- Really do Read All The Words. You don’t get a second chance to get it right.

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

1.3.2 Optional Bonus Assignments – extra marks

Assignment #03 HTML – Optional BONUS VIM Text Editor Practice
- this is an optional worksheet for a BONUS assignment using vim
- Optional Reading: The VI (VIM) Text Editor
- Worksheet #06 HTML – Optional 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.
Assignment #05 HTML – Optional BONUS Midterm Assignment
- This is an optional BONUS assignment reviewing your midterm test.
- There is a checking script available to verify the format of your file but only people who Read All The Words will find out about it.

3 From the Classroom Whiteboard/Chalkboard

See last week for the Midterm Test results.
Take notes in class! Your in-class notes would go here.
This week (Week 7) has a holiday Monday; the College is closed; no classes. Some students will miss their Monday lab, but can attend any other lab. (You can always attend any other lab.) In Week 7, section 010 Theory class 4pm Friday is cancelled (to match the section 020 Theory class missed on Monday); section 010 students come only to the Wednesday theory class.
Students who don’t do the worksheets or don’t have their own list of commands and what they do are wasting huge amounts of time struggling with the assignments, trying to complete them using Google. Most everything you need to know is in the worksheets and class notes.
Quick review of commands used in worksheets:
- copying a directory
- review difference between cp -r dir1 dir2 and mkdir dir2 ; cp -r dir1 dir2
- the hostname command shows your computer’s local name
- the whoami command shows your userid
- the wc command has useful options to limit output
- the locate command finds file names using an existing list
- the cut and awk commands select fields in lines
Using -ls instead of -print with find, e.g. find . -ls
what is the difference between grep and fgrep ?
No man page for bash built-in commands cd, alias, history, etc.
- use the help built-in command: help alias
Echoing command lines into files (instead of using a text editor) can be tricky. Suppose we want to save this command line: date | wc >out into a file named cmd.txt by using echo to echo it on the screen, and then redirecting the output into a file once what we see on the screen is correct. You can’t just put the word echo in front of the first command in a shell pipeline; it won’t echo the command line to the screen correctly. You have to quote all the shell metacharacters first:
- echo date | wc >out # doesn’t work; no output on screen
- echo 'date | wc >out' # hiding metacharacters does work – command appears on screen
- echo 'date | wc >out' >cmd.txt # correct: saves echo output in a file

3.1 Learning the Material

You learn the material because you want to be a Computer Systems Technician.
- You like doing this work; you want to be good at it.
Review your mistakes on the first midterm test (questions re-appear).
For practice tests and quizzes, see the Practice Test README
Review the commands used in each lab worksheet (and their common options).
- Unix/Linux Command List
Review how the shell works: GLOB, redirection, quotes
- Know why the shell behaves that way. Copy/paste teaches you nothing.
- split on semicolons and pipes first, then do redirection
What are the Four Rules for Output Redirection? Three Rules for Pipes?
- Unix Shell I/O Redirection (including Pipes)

CST8207 Week 07 Notes
File Systems

Ian! D. Allen – idallen@idallen.ca – www.idallen.com

Fall 2014 – September to December 2014