Updated: 2014-04-08 20:38 EDT
Do not print this assignment on paper!
- On paper, you will miss updates, corrections, and hints added to the online version.
- On paper, you cannot follow any of the hyperlink URLs that lead you to hints and course notes relevant to answering a question.
- On paper, scrolling text boxes will be cut off and not print properly.
10h00 (10am) Monday February 3, 2014 (start of Week 5)
WARNING: Some inattentive students upload Assignment #2 into the Assignment #1 upload area. Don’t make that mistake! Be exact.
Do not print this assignment on paper. On paper, you cannot follow any of the hyperlink URLs that lead you to hints and course notes relevant to answering a question.
This assignment is based on your weekly Class Notes.
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pagination program.Remember to READ ALL THE WORDS to work effectively and not waste time.
This is an overview of how you are expected to complete this assignment. Read all the words before you start working.
You will create file system structure in your CLS home directory containing various directories and files. You can use the Checking Program to check your work as you do the tasks. You can check your work with the checking program as often as you like before you submit your final mark. Some task sections below require you to finish the whole section before running the checking program; you may not always be able to run the checking program successfully after every single task step.
When you are finished the tasks, leave these files, directories, and links in place on the CLS as part of your deliverables. Do not delete any assignment work from the CLS until after the term is over!
Assignments may be re-marked at any time on the CLS; you must have your term work available on the CLS right until term end.
Since I also do manual marking of student assignments, your final mark may not be the same as the mark submitted using the current version of the Checking Program. I do not guarantee that any version of the Checking Program will find all the errors in your work. Complete your assignments according to the specifications, not according to the incomplete set of the mistakes detected by the Checking Program.
All references to the “Source Directory” below are to the CLS directory ~idallen/cst8207/14w/assignment02/
and that name starts with a tilde character ~
followed by a userid with no intervening slash. The leading tilde indicates to the shell that the pathname starts with the HOME directory of the account idallen
(seven letters).
You do not have permission to list the names of all the files in the Source Directory, but you can access any files whose names you already know.
These worksheets prepare you to do the numbered tasks listed below by executing commands via Remote Login to the Course Linux Server.
You can download Libre Office (or Open Office) for Windows to edit the Worksheet *.odt
files and save your answers. (Or you can print the PDF and write your answers on paper.) Do not use MSWord.
Record and save all your worksheet answers for study and quizzes!
PS1
variable syntax shown in Worksheet #02 HTML, set your prompt to include your user name, your computer name, and the basename of your current working directory. (See the definition of basename in the Pathnames class notes.)
[abcd0001@idallen-ubuntu ~]$
pwd
all the time!The CLS is on the public Internet; security is important. Choose your password carefully. Accounts that do not have their passwords changed before the due date of this assignment will be disabled.
Read on Wikipedia: Guidelines for strong passwords
Read this XKCD comic on good passwords
Now RTFM for the Unix command named passwd
(note the odd spelling). No arguments or options are needed to this command to change your own password. The passwd
command is also described in Worksheet #02 HTML.
Change your CLS password to one that is more secure than the one you were given. Find a way to remember your new password. If you forget your password, contact your Linux instructor to have it reset.
CST8207-14W
directory in your CLS HOME directory.Assignments
directory in the CST8207-14W
directory.assignment02
directory in the Assignments
directory.You can check this directory tree by making your HOME directory your current directory and using one of these tree
commands below. Try both command lines below and use the command that gives the best-looking output in your terminal.
$ tree CST8207-14W
$ tree -A CST8207-14W
The correct output will look similar to the ASCII tree diagram below. The spelling and capitalization must be exactly as shown.
CST8207-14W
`-- Assignments
`-- assignment02
This assignment02
directory is the base directory for most pathnames in this assignment. Store your files and answers below in this base assignment02
directory.
Run the Checking Program to verify your work so far.
You may find it easier to type if you make the base directory you created above (
assignment02
) your current directory for this section.
Copy the cal.txt
file you created in Assignment #01 HTML into the base directory using the new name calcopy.txt
for the file. The base directory now has one file in it (and nothing else).
mydir
directory is created in the base directory.mydir
create two new directories named one
and two
(three letters each).one
create new directory oneone
(six letters).two
create new directory twotwo
(six letters).Note: You can create the entire directory tree above using one single command with one option and two pathname arguments, as you did at the end of Section 4 in Worksheet #02 HTML. System administrators like to work efficiently – they learn how to do things quickly.
The correct directory tree under the base directory will look similar to the ASCII tree diagram below. The spelling and capitalization must be exactly as shown.
mydir
|-- one
| `-- oneone
`-- two
`-- twotwo
mydir
to new directory mydir2
using the correct directory copy option, as you did in Section 3 of Worksheet #03 HTML. (mydir2
should not exist before you do this! If it already exists, recursively remove it before you do the copy.)Verify that the tree structure of mydir2
is exactly the same as the mydir
directory from which you copied it.
Run the Checking Program to verify your work so far.
Make the base directory your current directory and then use a command to recursively generate a list of all pathnames under your mydir
directory. (You used this recursive command many times in the last section at the end of Worksheet #02 HTML. Do not use the tree
or ls
commands. Use the mydir
directory as your starting directory.) The recursive output of all pathnames under your mydir
directory will be exactly five lines long and will contain this exact line in the output somewhere (along with another four lines):
mydir/one/oneone
Make sure the exact line above appears as one of the five lines!
Recall that you can redirect any output that appears on your screen into a file by adding to the end of the command line a “greater than” angle bracket (
>
) followed by a file name. (We did this using thecal
command to create thecal.txt
file in the Week 1 lab.)
When the five lines of recursive output above on your screen looks correct, redirect the output of the command into the file named paths.txt
in the oneone
directory that you created earlier under the mydir2
directory. (Use a relative path down to the oneone
directory under mydir2
, as shown in the lectures.)
Make the oneone
directory under mydir2
your current directory. (Make sure you get the right one under mydir2
! Display your current working directory and make sure.)
Use a command to list the files in the current directory to confirm that the paths.txt
file is here. Use another command to display the contents of the paths.txt
file, and make sure it contains exactly five lines of pathnames from under the mydir
directory.
From the oneone
directory, copy the paths.txt
file (from the current directory) into the twotwo
directory that is also under the mydir2
directory, giving it the new name paths.txt.copy
as you copy it. Again, use relative paths to do the copy, as shown in the lectures. (Hint: Draw a file system hierarchy picture to help you derive the correct relative pathname.)
Use the echo
command to echo into file copycmd.txt
in the base directory the command line and two relative pathname arguments you used to make the above copy. The copycmd.txt
file should contain on one line the copy command name followed by two relative pathname arguments, exactly as you typed it. (The copycmd.txt
output file should be located in the base directory, not in the oneone
directory, so you need to specify a redirection pathname that leads up several levels to the base directory.)
Run the Checking Program to verify your work so far.
Execute this exact command line in your account on the CLS:
~idallen/cst8207/14w/assignment02/create
There is a leading tilde character ~
directly in front of the account name idallen
, indicating to the shell that the pathname starts with the HOME directory of idallen
(seven letters).
The command will create a directory named newdir
in your assignment02
directory. It will contain some sub-directories and files. Verify that newdir
has been created.
You can re-execute the above line to start over from scratch, if you make errors in this part of the assignment.
To know what files and directories have been created by the above command line, use a command that will recursively show all the files and directories under a starting directory. (You already used this command, above.)
All the following commands in this section apply to files and directories under the new
newdir
directory. You will have to use commands to find some of the file names mentioned here; they may be located under sub-directories. (See Searching and Finding Files.) Some of these tasks may require more than one command to complete.
Find and read the file named README.txt
(located somewhere under some directory under newdir
). You have to find this file.
Read and then delete the file foo.txt
that is in the same directory as the README.txt
file. (Do not delete any other decoy files named foo.txt
that may be in other directories.)
Move (rename) the file dst
to be dst.bak
(This is a move, not a copy. It renames the file.)
Directly under the newdir
directory, create a new empty directory named dst
(three letters). (Make sure you create dst
under newdir
, not in your HOME or any other directory.)
Find the file named services
(not the directory with the same name) and move (rename) that services
file to be named ports
under the new directory dst
that you just created. (This is a move/rename, not a copy.) Make sure you move the file, not the directory with the same name.
Run the Checking Program to verify your work so far.
Under the Source Directory there is a directory named maze
(four letters). (Recall that you do not have permission to list the names of all the files in the Source Directory, but you can access the maze
directory there because you know its name.)
This maze directory contains many hidden sub-directories. (You need a special option to see hidden files and directories.) In this maze, use a single command to recursively find the file with a 12-character basename that looks similar to abcd0001.txt
but where the eight-character abcd0001
part of the name is replaced by your own account userid. You must use a single command that finds files by basename to find this 12-character file name. Do not try to use cd
and ls
to find the file in the maze; the maze is very big. (You have previously used the command you will need here. Hint: Section 8 of Worksheet #02 HTML.)
When you have found your personal abcd0001.txt
file in the maze, create a new directory treasure
under assignment02
and copy your personal file into that new directory using the new name myfile.txt
under your treasure
directory. Read the file to make sure it’s the right one before and after you copy it into the treasure
directory.
Run the Checking Program to verify your work so far.
That is all the tasks you need to do.
Check your work a final time using the Checking Program and save the output as described below. Submit your mark following the directions below.
Summary: Do some tasks, then run the checking program to verify your work as you go. You can run the checking program as often as you want. When you have the best mark, upload the marks file to Blackboard.
There is a Checking Program named assignment02check
in the Source Directory on the CLS. You can execute this program by typing its (long) pathname into the shell:
~idallen/cst8207/14w/assignment02/assignment02check
Execute the above “check” program. This program will check your work, assign you a mark, and display the output on your screen. (You may want to paginate the long output so you can read all of it.)
You may run the “check” program as many times as you wish, to correct mistakes and get the best mark. Some tasks sections require you to finish the whole section before running the checking program at the end; you may not always be able to run the checking program successfully after every single task step.
When you are done with checking this assignment, and you like what you see on your screen, redirect the output of the Checking Program into the text file assignment02.txt
under your assignment02
directory on the CLS. Use the exact name assignment02.txt
in your assignment02
directory. Case (upper/lower case letters) matters. Be absolutely accurate, as if your marks depended on it. Do not edit the file. Make sure the file actually contains the output of the checking program!
Transfer the above assignment02.txt
file from the CLS to your local computer and verify that the file still contains all the output from the checking program. Do not edit this file! No empty files, please! Edited or damaged files will not be marked. You may want to refer to your File Transfer notes.
Submit the assignment02.txt
file under the correct Assignment area on Blackboard (with the exact name) before the due date. Upload the file via the assignment02 “Upload Assignment” facility in Blackboard: click on the underlined assignment02 link in Blackboard. Use Attach File and Submit to upload your plain text file.
No word-processor documents. Do not send email. Use only “Attach File”. Do not enter any text into the Submission or Comments boxes on Blackboard; I do not read them. Use only the “Attach File” section followed by the Submit button. If you need to comment on any assignment submission, send me email.
You can upload the file more than once; I only look at the most recent. You must upload the file with the correct name; you cannot correct the name as you upload it to Blackboard.
Verify that Blackboard has received your submission: After using the Submit button, you will see a page titled Review Submission History that will show all your submissions. Verify that your latest submission has the correct 16-character, lower-case file name attached to it beside the Attached Files heading. (The Submission Field and Student Comments headings must be empty; I do not read them.) You will also see the Review Submission History page any time you already have an assignment attempt uploaded and you click on the underlined assignment02 link.
You cannot delete an assignment attempt, but you can always upload a new version. I only mark the latest version.
Your instructor may also mark files in your directory in your CLS account after the due date. Leave everything there on the CLS. Do not delete any assignment work from the CLS until after the term is over!
I do not accept any assignment submissions by email. Use only the Blackboard Attach File. No word processor documents. Plain Text only.
Use the exact file name given above. Upload only one single file of plain text, not HTML, not RTF, not MSWord. No fonts, no word-processing. Plain text only.
Did I mention that the format is plain text (VIM/Nano/Pico/Gedit or TextEdit or Notepad)?
NO EMAIL, WORD PROCESSOR, PDF, RTF, or HTML DOCUMENTS ACCEPTED.
No marks are awarded for submitting under the wrong assignment number or for using the wrong file name. Use the exact 16-character, lower-case name given above.
WARNING: Some inattentive students don’t read all these words. Don’t make that mistake! Be exact.
READ ALL THE WORDS. OH PLEASE, PLEASE, PLEASE READ ALL THE WORDS!