2>&1
Winter 2018 - January to April 2018 - Updated 2018-04-04 12:11 EDT
find
using “wildcard” (GLOB) patterns - same as shell GLOBvi/vim, nano
head, tail
Note that your upcoming Midterm Test #1 is worth more than three assignments put together. Don’t spend all your time doing an assignment at the expense of studying the Practice Tests and Answers for the Midterm Test.
Check the due date for each assignment and put a reminder in your agenda, calendar, and digital assistant. Just like in the Real World, not all due dates are on the same days or at the same times.
PS1 find mkdir mv cp rm touch file
PS1
prompt every time you log in to the CLS.Note that your upcoming Midterm Test #1 is worth more than three assignments put together. Don’t spend all your time doing an assignment at the expense of studying the Practice Tests and Answers for the Midterm Test.
Worksheets are preparation for your assignments. You can’t do the assignments without having done the worksheets first, and you can’t do the worksheets without having first read the Course Notes: 1. Read. 2. Worksheets. 3. Assignment.
Make notes from the worksheets on how each command works. What do the options used in the worksheets mean, for each command? (See the weekly List of Commands.)
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 are not for hand-in; they are not worth marks; the assignments test your knowledge of the lectures and 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 Worksheet 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 get a copy here: Course Introduction: Install Libre Office.
Worksheets #02 and #03 require you to have read File System and Pathnames:
PS1, cd, find, less, ls, man, mkdir, passwd, pwd, rmdir
PS1
prompt every time you log in to the CLS.cat, clear, cp, find, fgrep, history, less, man, mv, rm, sleep, touch
Worksheets #04 and #05 require you to have read Shell GLOB patterns and Shell I/O Redirection:
alias, sum, unalias
date, head, nl, tail, tr, wc
Worksheet #06 is for the optional VIM Bonus Assignment (extra credit):
vim
vimtutor
program on the CLS.Worksheets prepare you for the upcoming assignments.
See the Week 03 Notes HTML for details on the upcoming tests.
Midterm Test #1 updated February 7 to exclude GLOB and I/O redirection
See the Week 03 Notes HTML for details.
Practice Test #1 and Blackboard Quiz #1 updated February 7 to exclude GLOB and I/O redirection
See the Week 03 Notes HTML for details.
Take notes in class! Keep a pad open on your desk.
This week, we learn how to match file names using GLOB patterns and then about I/O redirection and pipes.
Note that your upcoming Midterm Test #1 is worth more than three assignments put together. Don’t spend all your time doing an assignment at the expense of studying the Practice Tests and Answers for the Midterm Test.
Rewrite each pathname as a simplified absolute pathname:
/home/me/../you/../../etc/../home/me/../you/../me/../foo
/home/me/../you/../../etc/../home/me/../you/../me/../..
/usr/./bin/../lib/../../etc/../usr/./lib/../bin/./bar
/usr/./bin/../lib/../../etc/../usr/./lib/../bin/..
/../../var/./a/../../var/b/../../etc/./bar/../foo
/../../var/./a/../../var/b/../../etc/./bar/..
These questions and the answers are part of Practice Test #1 in Practice Tests and Answers. Look for questions starting with “Simplify this pathname”.
See last week’s note about drawing file system diagrams: Week 03 Notes HTML
Keep a notebook with a List of Commands in it.
- You need to write down yourself what each command does.
- Check the updated list of commands each week.
- I will check for this list in your lab periods.
- Bring your notes to class! Stop wasting time looking up commands.
-name
arguments to find
find
GLOB patterns to hide them from the shell!ls -d
: The man page says “list directories themselves, not their contents”. It doesn’t say “list only directories;, do not list files”. If you give a file and a directory to ls -l -d
, you will get the file name and the directory name in the output. If you give a file and a directory to ls
without -d
, you will get the file name and the contents of the directory (not the directory name itself) in the output. See the difference? The -d
shows the directory itself, not what is in the directory.Many students find that hiring a personal tutor helps them get through the first term. Financial assistance is available. See the Tutoring heading in the Course Introduction.
From: Charles Nixon
Subject: Saturday Open Labs
Date: Monday, January 29, 2018 2:36 PM
Starting this Sat Feb 03 from 9am-12pm rooms T113, T114 and T111
will be opened for students to use.
A tutor (Julie Labadie 4^th semester CST) will be supervising and
available for drop in tutoring.
The Linksys SOHO routers from T111 will be signed out from Julie in T113.
Please share this with your students, the hallway schedules have
been updated with the open lab times.
You are not paranoid if they really are out to get you! See the Week 03 Notes HTML for command pipelines to count the attacks on the CLS.
In addition to the SSH attacks, machines on the Internet receive attacks using bogus HTTP requests. See last week’s notes for details.
When you are locked out, follow the directions in the notes to get your IP address re-enabled.