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{{Admon/caution|DO NOT USE THIS VERSION OF THE LAB. This page will no longer be updated.|'''New version here:''' https://seneca-ictoer.github.io/ULI101/A-Tutorials/tutorial4<br />'''Andrew's students please go here:''' http://wiki.littlesvr.ca/wiki/OPS145_Lab_4}}
=Data Representation / Numbering Conversion / File Permissions=
|- valign="top" style="padding-left:15px;"
|colspan="1" width="22%"|'''Slides:'''<ul><li>Week 4 Lecture 1 Notes:<br> [[Mediahttps://wiki.cdot.senecacollege.ca/uli101/slides/ULI101-Week44.1.pdf | PDF]] | [https://matrixwiki.cdot.senecacollege.ca/~chris.johnsonuli101/ULI101slides/ULI101-Week44.1.pptx PPTX]<br/li><li>Week 1 4 Lecture 2 Notes:<br> [[Mediahttps://wiki.cdot.senecacollege.ca/uli101/slides/ULI101-Week44.2.pdf | PDF]] | [https://matrixwiki.cdot.senecacollege.ca/~jason.carmanuli101/slides/ULI101-Week44.2.pptx PPTX] <br></li></ul>
=INVESTIGATION 1: NUMBERING CONVERSIONS=
<span style="color:red;">'''ATTENTION''': Effective '''May 9, 2022''' - this This online tutorial will be required to be completed by '''Friday in week 5 by midnight'''<br>to obtain a grade of '''2%''' towards this course</span><br><br>
For this investigation, we will NOT be logged into our Matrix account, but it is recommended to have an '''MS Word document'''<br>open to manually perform numbering conversions.
'''Perform the Following Steps:'''
# Let's convert the following ''8-bit'' binary number '''10111110''' to a '''<u>decimal number</u>'''.<br><br><span style="color:blue;">'''NOTE:''' It is important to learn and '''memorize''' the '''correct methods''' to perform the<br>proper numbering conversion method (i.e. view '''method 1''' above (drawing the L's).</span><br><br>
# Write the manual conversion either in your MS Word document.<br><br>
# Use a '''calculator''' to check your work. In MS Windows, you can set the calculator to Programming mode<br>by making the selection to '''binary''', enter the binary number '''10111110''' and view the decimal equivalent.<br><br>Did you get the correct answer? If not, <u>retry</u> the method and check to see what you did wrong.<br><br>
# Perform a manual conversion of the '''decimal number 55''' to an a '''<u>8-bit binary number</u>'''.<br>What method (displayed above) will you use? Use a calculator to check your work.<br><br># Perform a manual conversion of the '''octal number 461''' to an a '''<u>8-bit binary number</u>'''.<br>What method (displayed above) will you use? Use a calculator to check your work.<br><br># Perform a manual conversion of the '''8-bit binary number 11110001''' to a '''<u>hexadecimal number</u>'''.<br>What method (displayed above) will you use? Use a calculator to check your work.<br><br># Perform a manual conversion of the '''hexadecimal number ABC''' to an a '''<u>8-bit binary number</u>'''.<br>What method (displayed above) will you use? Use a calculator to check your work.<br><br>
# Perform a manual conversion of the '''binary number 10101111''' to an '''<u>octal number</u>'''.<br>What method (displayed above) will you use? Use a calculator to check your work.<br><br>
# Perform a manual conversion of the same '''binary number 10101111''' to a '''<u>hexadecimal number</u>'''.<br>What method (displayed above) will you use? Use a calculator to check your work.<br><br>
# Issue the following: <span style="color:blue;font-weight:bold;font-family:courier;">~uli101/week4-check-4</span><br><br>If you encounter errors, make corrections and then re-run the checking script until you receive a congratulations message<br>and then continue with this tutorial.<br><br>
# Logout of your Matrix account, and then log-back into your Matrix account.<br><br>
# Issue the following Linux command (without arguments): <span style="color:blue;font-weight:bold;font-family:courier;">umask</span><br><br>What happened? Referring to your notes, what do you need to do to make that umask value persistent?<br><br><span style="color:red;">'''WARNING''':<br>You should be <u>extremely</u> aware of your permissions since you may perform '''assignmentsmarked work''' for <u>other</u> courses on your '''Matrix''' server.<br>You should NOT set permissions to share your work with '''same group''' or '''other group''' members (unless given '''specific permissions instructions from your course professors''' involving '''assignment submission'''). If students can have access to your directories and assignment project files, they could '''copy''' your work and thus make yourself and other student(s) that copied your assignment work<br>to be charged with '''academic dishonesty'''.</span><br><br>: After you complete Complete the Review Questions sections to get additional practice, then work on your '''online assignment 2'''<br>and complete the sections '''1''' and '''2''' labelled: '''Practice Using The vi Text Editor''' and '''Permissions''' respectively.<br><br>
= LINUX PRACTICE QUESTIONS =
The purpose of this section is to obtain extra practice to help with your assignment #1, quizzes, your midterm, and your final ezamexam.
Here is a link to the MS Word Document of ALL of the questions displayed below but with extra room to answer on the document to
simulate a quiz:
https://ictwiki.cdot.senecacollege.ca/~murray.saululi101/uli101files/uli101_week4_practice.docx
Your instructor may take-up these questions during class. It is up to the student to attend classes in order to obtain the answers to the following questions. Your instructor will NOT provide these answers in any other form (eg. e-mail, etc).
'''Review Questions:'''
# Write a simple chart to show which values are represented for letter '''A - F''' for a hexadecimal number.
# How many '''binary''' digits does 1 octal digit represent?
# How many '''binary''' digits does 1 hexadecimal digit represent?[[Image:number-conversion-chart.png|right|450px|thumb|]]
# Use '''manual numbering conversion''' to complete the table displayed to the right.
<span style="font-family:courier;font-weight:bold">chmod u=rwx,go=x ~/linux/content</span><br>What would be the new permissions for the “'''content'''” directory?<br><br></li><li>Assume that you just issued the commands:<br><span style="font-family:courier;font-weight:bold;">umask 077<br>mkdir mydir<br>touch mydir/myfile.txt<br></span><br>What would be the permissions for the newly created '''directory''' and '''regular file'''?<br>(show your work)
</li></ol>
_________________________________________________________________________________
Author: Murray Saul
License: LGPL version 3
Link: https://www.gnu.org/licenses/lgpl.html
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[[Category:ULI101]]
