:* Understand the Purpose purpose of the Unix / Linux '''Directory Structuredirectories'''.  :* List and '''Common Directories''' that are Contained in a Typical '''Unix / Linux Filesystemdirectory pathnames'''. :* Use Common common '''Unix / Linux Commandscommands''' to Perform perform '''Directory Managementdirectory management''' Taskstasks. :* Use Common '''Text Editors''' to create and modify text files:* Use Common Unix / Linux Commandscommands to ''' to Perform manage''' and '''Text File Managementmanipulate''' Taskstext files. :* Using Text Editors to Create and Manipulate Text Files<br><br>

|colspan="32" style="font-size:16px;font-weight:bold;border-bottom: thin solid black;border-spacing:0px;padding-left:15px;"|Linux Command/Shortcut Reference<br>

|colspan="1" |Course Notes'''Slides:'''<ul><li>Week 2 Lecture 1 Notes:<br>[https://ictwiki.cdot.senecacollege.ca/~uli101/notesslides/Week02ULI101-2.1.pdf PDF] | [https://ictwiki.cdot.senecacollege.ca/~uli101/notesslides/Week02ULI101-2.1.pptx PPTX]</li><li>Week 2 Lecture 2 Notes:<br> [https://wiki.cdot.senecacollege.ca/uli101/slides/ULI101-2.2.pdf PDF] | [https://wiki.cdot.senecacollege.ca/uli101/slides/ULI101-2.2.pptx PPTX]</li></ul>'''Tutorials:'''<ul><li>[http://www.cheat-sheets.org/saved-copy/Nano_Cheat_Sheet.pdf Nano Reference Sheet (PDF)]</li><li>[https://www.smashingmagazine.com/2010/05/vi-editor-linux-terminal-cheat-sheet-pdf Vi Reference Sheet]</li><li>[http://czegel.com/seneca/uli101/lectures/Lecture2.html Les Czegel's Week 2 Notes (HTMLPDF)]</li></ul>

| style="padding-left:15px;" |Directory and '''File Management Commands:'''

| style="padding-left:15px;"|'''Text Editors /<br>File Management CommandsContent:'''*[http://man7.org/linux/man-pages/man1/vi.1p.html vi] , *[https://linux.die.net/man/1/nano nano]<br>

|colspan="1" styleKEY CONCEPTS="padding-left:15px;" width="30%"|Brauer Instructional Videos:<ul><li>[https://www.youtube.com/watch?v=UfAFAipked0&list=PLU1b1f-2Oe90TuYfifnWulINjMv_Wr16N&index=3 Basic File Actions<br>(touch, ls -l, cp, cp -r, mv, mkdir, mkdir -p, rm, rmdir, rm -r)]</ul> |}

[[Image:directory-structure-1.png|thumb|right|350px|In Unix / Linux (as opposed to MS Windows), there are no drive letters (such as '''C:''', or '''D:''').<br><br> All files and directories appear under a single ancestor directory called "the '''root''' directory".<br><br>A path points to a file system location by ]]To better '''following the directory tree hierarchyorganize''' expressed in a string of characters in which path componentsfiles (eg. text, images, documents, separated by a delimiting characterspreadsheets, represent each directory. The programs) within your Matrix account, they should be stored in '''delimiting characterdirectories''' is most commonly the slash ("'''/'''").]]The UnixTo further organize <u>many</Linux file system is '''hierarchical'''u> files, similar to other operating systems such asdirectories<br>may contain '''Windows''', '''Mac OSX''', etc.Files are organized in directories. Directories may contain sub-directories. In Unix / Linux (as opposed to MS Windows), there are no drive letters (such as C:, or D:). All files and directories appear under a single ancestor directory called the "'''root directory'''". Learning how to issue Linux commands for navigating the Linux filesystem and manipulating directory and files are essential skills for Linux users and administrators.

In the The Unix / Linux (Unix) OS, the "file system is '''root directoryhierarchical'''" / is the starting directory, and like other "child directories"operating systems such as '''Windows''', "grandchild directories"'''macOS''', etc. In Unix / Linux (as opposed to Windows), there are createdThe hierarchical structure resembles an "upside- down tree"no drive letters (such as '''C:''', or '''D:'''). There is actually a command called tree that can display a "tree diagram"!<br><br>

A Learning how to issue Linux commands for '''pathnavigating''', the general form of the name of a file or directory, specifies a and '''unique locationmanipulating''' in a file system. A path points to a file system location by '''following directory and files within the the directory tree hierarchy''Linux filesystem are ' expressed in a string of characters in which path components, separated by a delimiting character, represent each directory. The ''essential skills'delimiting character''' is most commonly the slash for Linux users and Linux system administrators ("''i.e. '/'sysadmins''").

Reference: https:In the Linux (Unix) OS, the "'''root directory'''" //enis the starting directory, and other "''child directories''", "'''grandchild directories'''", etc. can be created as required.wikipediaThe hierarchical structure resembles an "''upside-down tree''".org/wiki/Path_(computing)

The === Directory Pathnames ===[[Image:path-name.png|thumb|right|180px|A pathname points to a file system location by '''following table displays and defines commonly used directories<br>(listed by the directory tree hierarchy'''.]]''A '''pathname) for for ALL Unix / Linux Filesystems:<br>''' is used to specify a '''route to a file''' within the file system.

Please take A pathname '''points''' to a file system location by '''following the directory tree hierarchy''' expressed in a string of characters in which path components, separated by a few moments to review these pathnamesdelimiting character, represent each directory. The '''delimiting character''' is most commonly the slash ("'''/'''").'' Reference: https://en.wikipedia.<br><br>org/wiki/Path_(computing)

[[Image:directory-structure-2.png|thumb|right|500px|Commonly The following table displays and defines '''commonly used directories ''' (listed by directory pathname)<br>for for ALL Unix / Linux Filesystems.]]<table cellpadding="5"><tr><th style="border-bottom: 1px solid black;">Directory Pathname</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr><td>'''/'''</td><td>Root directory (ancestor to all directories)</td></tr><tr><td>'''/home'''</td><td>Used to store users’ home directories</td></tr><tr><td>'''/home/username'''</td><td>A Particular User's Home Directory</td></tr><tr><td>'''/bin'''</td><td>Common system binaries (commands) </td></tr><tr><td>'''/usr/bin'''</td><td>Common utilities (commands) for users. </td></tr><tr><td>'''/usr/sbin'''</td><td>Common utilities for system administration </td></tr><tr><td>'''/etc'''</td><td>System administration files (eg. passwd)</td></tr><tr><td>'''/var'''</td><td>Dynamic files (log and mail files)</td></tr><tr><td>'''/tmp , /var/tmp'''</td><td>Temporary files for programs</td></tr><tr><td>'''/dev'''</td><td>Device driver files (terminals, printers, etc.)</td></tr></table><br>

Every user when receiving an When you log into your Matrix account has a “home” directory created (, you are automatically directed to your '''/home/userid''')directory. This directory is where the user keep can store files, and create subdirectories and personal to organize their files.

We will now learn =INVESTIGATION 1: CREATING &amp; MANAGING DIRECTORIES={{Admon/caution|This weekly tutorial must be completed by Friday in Week 3 by 11:59pm to create and manage subdirectories within your own home directoryobtain a grade of 2% towards this course.<br><br>|}}

=INVESTIGATION 1: MANAGING DIRECTORIES= <br>In this investigation, you will learn how to manage directories including their '''creationcreate''', '''navigationnavigate''', '''listing list directory contents''' and '''removalremove'''directories in your Matrix account.

Before learning you learn how to create directories, it is important to understand what represents an appropriate '''directory filename'''.

Some of the basic Listed below are some common '''file-naming rules''' are:

* Adopt a '''consistent directory naming scheme''' – (this will help you to navigate within your directory structure later)

* '''Avoid using spaces''' for directory names – (consider periods, hyphens, and underscores instead)

[[Image:directory-structure-3.png|thumb|right|350px|'''Tree Diagram''' of Directory Structure to Create in your '''Home ''' Directory (displayed in blue text).]]

A comparison would be rooms in a '''house'''. If there were no rooms, just one large room in a 3,000 square foot house, it would be "messy" and difficult to locate items. Each '''room''' in a house is used to for a '''specific purpose ''' to be more productive to perform a task such as a kitchen, bedroom, bathroom, etc.

You would like to create a directory structure within your home directory as displayed in '''Perform the diagram on the right aide.Following Steps:'''

You should note from the previous section that the For example, if your Seneca user ID was '''rootmkhan''' directory is then you would display the <br>"'''starting point'''" in the Matrix file system, that the 'pathname ''/home''' directory is used to store all Matrix user accounts by their userid, and that '''/your userid-seneca-id''as: ' contained within the home directory represents '''<u>'''YOUR'''</u> home directory/mkhan''' where you can create files (both directory files, text files, etc).

'''Perform Although you are being asked to create the Following Stepsdirectory structure, you might have made some mistakes:'''<br>For Example:<br>

# '''Login''' your matrix account.<br><br># Issue a command to '''confirm''' you are located in your home directory. You should know how to do this from the previous tutorial.<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">mkdir uli101</span><br><br>'''NOTE:''' You should always confirm that you have created a directory. This can be done by issuing the ls command.<br><br>[[Image:directory-structure-4.png|thumb|right|350px|'''Creating''' and '''Confirming''' the Creation of a Directory.]]# Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">ls uli101</span><br><br>There are no contents that are contained in this newly-created directory; therefore, no contents appear. A useful option '''-d''' can be used to confirm that the actual <u>directory</u> has been created as opposed to viewing the contents of the directory.<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">ls -d uli101</span><br><br>You should now see just the directory listed. You can also combine the -d and -l options to provide more detail regarding the newly-created directory.<br><br># Issue the following Linux command:<span style="color:blue;font-weight:bold;font-family:courier;">ls -d -l uli101</span><br><br>How can you confirm from the output of this command that the file uli101 is a directory?<br><br># Issue the following Linux command:<span style="color:blue;font-weight:bold;font-family:courier;">ls -ld uli101</span><br><br>Is the output from this command the same was the output from the previous command? If so, what does this say about how to use multiple options for Linux commands?<br><br># Issue the following Linux command * Forgetting to create the apc100 and xyz100 directories:<span style="color:blue;font-weight:bold;font-family:courier;">mkdir apc100 xyz100</span><br><br>'''NOTE:''' You should now notice that you can create multiple directories by issuing the mkdir with multiple arguments.<br><br># Issue the following Linux command to confirm that those directories have been created: <span style="color:blue;font-weight:bold;font-family:courier;">ls -ld apc100 xyz100</span><br><br># We will now create the subdirectories that are contained in the '''uli101''' directory. Issue the following Linux command to move to the uli101 directory: <span style="color:blue;font-weight:bold;font-family:courier;">cd uli101</span><br><br># Issue a command to confirm that your current location is in the uli101 directory. You should know how to issue this command from a previous tutorial.<br><br># Issue the following Linux command to create the directories called '''notes''', '''tutorials''' and '''examples''': <span style="color:blue;font-weight:bold;font-family:courier;">mkdir notes tutorials examples</span><br><br># Issue a Linux command to confirm that those directories have been created* Making syntax errors (eg. You should know how to do this...<br><br>spelling or mixing up character case)#This technique is considered to be '''inefficient'''... There are options and ways to create the same directory structure without using the cd command and only issue a single Linux command.<br><br>Using this inefficient method tends to show that you are a novice or "'''newbie'''", and you may '''lose marks''' if you issue multiple Linux commands to performed tasks that can be performed using only a single Linux command.<br><br>Although we will teach you how to '''remove''' directories and their contents in a future section, let's change back to your '''home''' directory and issue a command to '''remove the directory structure''' that you just created so you can learn a more efficient method of * Not creating the same directory structure.<br><br># Issue Linux commands to move to your home directory and confirm that your current directory is your home directory. You should know how to do this...<br><br># Issue the following Linux command to remove all of the subdirectories within specified directories that you have created:<br><span style="color:blue;font-weight:bold;font-family:courier;">rm -r uli101 apc100 xyz100</span><br><br>'''NOTE:''' You will learn how to safely remove directories and their contents in another section.<br><br># Issue the following single Linux command to create the entire directory structure:<br><span style="color:blue;font-weight:bold;font-family:courier;">mkdir -p uli101/notes uli101/tutorials uli101/examples acp100 xyz100</span><br><br>'''NOTE:''' The '''-p''' option allows "parent" directories to be automatically created first to then create their subdirectories.<br><br># Issue the following Linux command to confirm that all of the directories have been created:<br><span style="color:blue;font-weight:bold;font-family:courier;">ls -ld uli101 uli101/notes uli101/tutorials uli101/examples apc100 xyz100</span><br><br> '''Downloading & Running a Shell Script to Check your Work''' Although you are being asked to create the directory structure, this author has no idea that you have performed it correctly:

<table align="right"><tr valign="top"><td>[[Image:script-check-1.png|thumb|right|250px|If all checks pass, then user performed task correctly and can continue.]]</td><td>[[Image:script-check-2.png|thumb|right|450px|If there is a warning, then feedback is provided to user to correct and re-run checking script.]]</td></table>To check that you haven't made for mistakes so you won't encounter problems in the next section , a '''shell script''' has been created to check your work. If the checking shell script detects an '''error''', then it will provide feedback and offer constructive feedback on how to fix that problem so you can re-run the checking shell scripts until your work is correct.

# Issue the following Linux command to download run a '''shell checking script''' to your home directory that will check your work:<br><span style="pointer-eventscolor: noneblue;cursorfont-weight: defaultbold;colorfont-family:bluecourier;">wget https://matrix.senecacollege.ca/~murray.saul/uli101/week1week2-check-1</span><br><br># Run If you encounter errors, then view the feedback to make corrections, and then re-run the checking script . If you receive a congratulation message that there are no errors, then proceed to check your work by issuing the following:<br><span style="color:blue;font-weight:bold;font-family:courier;">bash week1-check-1</span><br>next part.<br>

Now that you have learned how to efficiently create your directory structure, you will now learn how to issue Linux commands <br>to '''view directory contents contained in directories, ''' as well as '''copy ''' and '''move ''' directories.

<table align="right"><tr valign="top"><td>[[Image:directory-structure-5.png|thumb|right|250px|Output of the '''tree''' command to display directory structure.]]</td><td>[[Image:directory-structure-6.png|thumb|right|250px|Output of the '''ls -lRR''' command to display directory structure.]]</td></table># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">tree</span><br><br>'''NOTE:''' You should see the directory structure that you created in the previous sectioninvestigation. You can also issue the '''tree ''' command using a directory pathname to display the directory structure for a specific scope.<br><br>You can also use the '''-R ''' option for the '''ls ''' command to display all directories and subdirectories for a specified directory path (referred to as a "'''recursive directory listing"''').<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">ls -lR</span><br><br>What directories do you see?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">ls -lR uli101uli101xx</span><br><br>Note the differences between both of these commands(i.e. using and <u>not</u> using a pathname).<br><br>You can copy and move entire directories (and their contents) to other directories.<br><br><table align="right"><tr valign="top"><td>[[Image:directory-structure-7.png|thumb|right|250px|Output of the '''tree''' command to confirm copy of '''uli101uli101xx''' directory (and contents) to the '''xyzxyz100xx''' directory.]]</td><td>[[Image:directory-structure-8.png|thumb|right|300px|Output of the '''tree''' command to confirm movement of '''apc100 acp100 directory''' directory (and contents) to the '''xyzxyz100xx''' diredtory.]]</td></tr></table># Issue the following Linux command: <br><span style="color:blue;font-weight:bold;font-family:courier;">cp -R uli101 xyz100uli101xx xyz100xx</span><br><br>Note the differences between both of these commands.<br><br>#Issue the following Linux command to display the directory structure of your home directory to confirm you copied the uli101 uli101xx directory:<br><span style="color:blue;font-weight:bold;font-family:courier;">tree</span><br><br><br><br><br><br># Issue the following Linux command:<br><span style="color:blue;font-weight:bold;font-family:courier;">mv apc100 acp100xx xyz100xyz100xx/uli101uli101xx/tutorials</span><br><br>Note the differences between both of these commands.<br><br>#Issue the following Linux command to display the directory structure of your home directory to confirm you copied moved the uli101 acp100xx directory:<br><span style="color:blue;font-weight:bold;font-family:courier;">tree</span><br><br>Let's download and run a checking script to see if you moved and copied the directories correctly.<br><br>

# Issue the following Linux command to download a '''shell run checking script''' to your home directory that will check your work:<br><span style="color:blue;font-weight:bold;font-family:courier;">wget URL~uli101/week2-check-2</span><br><br># Run If you encounter errors. make corrections and re-run the checking script until you receive a congratulations message, and proceed to check your work by issuing the following:<br><span style="color:blue;font-weight:bold;font-family:courier;">bash filename</span>next investigation.<br><br>

In a previous section, you learned to remove empty and non-empty directories to learn how to create a directory structure more efficiently.<br>In this sectioninvestigation, we will learn how to '''safely remove ''' directories and their contents.

# Confirm that you are located in your home directory.<br><br>The '''rmdir ''' command is used to remove <u>empty </u> directories.<br><br># Issue the following Linux command to remove the empty directory called '''uli101/tutorials''': <span style="color:blue;font-weight:bold;font-family:courier;">rmdir uli101uli101xx/tutorials</span><br><br># Issue a command to confirm that you removed the '''tutorials''' directory.<br><br># Issue the following Linux command to remove the empty directory called '''uli101uli101xx''': <span style="color:blue;font-weight:bold;font-family:courier;">rmdir uli101uli101xx</span><br><br>NOTE: You should get an '''error message''', since the '''uli101uli101xx''' directory is '''NOT''' empty.<br><br>To remove non-empty directories, you can use the '''rm -r''' command.<br>The '''-r''' option stands for recursive, which can travel down the directory paths and their contents.<br><br># Issue the following Linux command to remove the '''uli101uli101xx''' directory and its contents: <span style="color:blue;font-weight:bold;font-family:courier;">rm -r uli101uli101xx</span><br><br># Issue the '''tree''' command to confirm that the uli101 uli101xx directory (contained in your home directory) and its contents have been removed.<br><br>'''NOTE: ''' To <u>safely </u> remove non-empty directories, you can add the '''-i ''' option which will prompt the user if they wish to remove contents as it your travel recursively down a directory to remove directories and their contents.<br><br># Issue the following Linux command (entering "y" when prompted): <span style="color:blue;font-weight:bold;font-family:courier;">rm -ri xyz100xyz100xx</span><br><br>'''NOTE: ''' You should have removed all directories that you have created.<br><br>Let's download and run a checking script to see if confirm that you have correctly removed all of the those directories that you earlier created.<br><br># Make certain that your current directory is Issue the '''your home directorytree'''command to confirm that all of those recently created directories have been removed.<br><br># Issue the following Linux command to download run a '''shell checking script''' to your home directory that will check your workconfirm removal of those directories:<br><span style="color:blue;font-weight:bold;font-family:courier;">wget URL~uli101/week2-check-3</span><br><br># Run If you encounter errors, make corrections and re-run the checking script until you receive a congratulations message, and proceed to check your work by issuing the following:<br><span style="color:blue;font-weight:bold;font-family:courier;">bash filename</span>next INVESTIGATION.<br><br>

'''Perform the Following Steps===Part 1:'''Creating Text Files Using The Nano Text Editor===

# x ===Part 2: Viewing / Manipulating Text Files === x<br><br>You will now learn basic editing skills using the '''Nano''' text editor including '''creating''', '''editing''', and '''saving''' text files.

# Make certain that you are located in your home directory.<br><br>[[Image:directory-structure-10.png|right|150px|thumb|]]# '''Create''' the following directory structure (displayed on the right side) by issuing a '''single Linux command'''<br>(You should know how to do this from the previous INVESTIGATION).<br><br># Issue a Linux command to check that you correctly created those directories.<br><br># Issue the following Linux command to edit a text file called '''mytext.txt''' in the '''linux/practice''' directory:<br><span style="color:blue;font-weight:bold;font-family:courier;">nano textedit/practice/mytext.txt</span><br><br>'''NOTE:''' When using the '''Nano''' text editor, you are placed in '''INPUT''' mode, so you can enter text immediately.<br><br>[[Image:nano-text-editor-2.png|right|400px|thumb|Enter the following text that appears in this diagram.]]# Enter the lines shown in the other diagram of the nano text editor on the right side.<br><br>'''NOTE:''' Refer to the table below for a list of common '''Nano''' navigation &amp; editing commands:<br><br><table cellpadding="5"><tr><th style="border-bottom: 1px solid black;">Key(s)</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr valign="top"><td style="font-family:courier">'''&lt;ctrl&gt;&lt;SPACEBAR&gt;''',<br>'''&lt;esc&gt;&lt;6&gt;'''</td><td>Move forward/backward one word</td></tr><tr valign="top"><td style="font-family:courier">'''&lt;ctrl&gt;&lt;a&gt;''',<br> '''&lt;ctrl&gt;&lt;e&gt;'''</td><td>Move to beginning/end of line</td></tr><tr><td style="font-family:courier">'''&lt;ctrl&gt;&lt;k&gt;'''</td><td>Cut line</td></tr><tr><td style="font-family:courier">'''&lt;esc&gt;6'''</td><td>Copy Line</td></tr><tr><td style="font-family:courier">'''&lt;ctrl&gt;&lt;u&gt;'''</td><td>Paste Cut/Copied Text</td></tr><tr><td style="font-family:courier">'''&lt;ctrl&gt;&lt;g&gt;'''</td><td>Display help screen (ctrl-xto exit help screen)</td></tr><tr><td style="font-family:courier">'''&lt;ctrl&gt;&lt;x&gt;'''</td><td>Save editing changes and exit</td></tr></table><br># Referring to the table above, practice navigating and editing your entered lines for practice.<br><br># To '''save''' your editing session, press: <span style="color:blue;font-weight:bold;font-family:courier;">&lt;ctrl&gt;x</span><br><br># You will be prompted to modify your file: type the letter <span style="font-family:courier;color:blue;font-weight:bold">y</span> for '''yes'''.<br><br># The name of the file will be displayed, Press <span style="color:blue;font-weight:bold;font-family:courier;">ENTER</span>.to save editing changes for that file name.<br><br>'''NOTE:''' This prompt for file name allows you to change the name of the file if you wish.<br>By pressing '''ENTER''', it will accept the default filename.<br><br># Perform some more editing operations based on the editing chart above.<br><br># '''Save''' your editing session and '''exit''' your text editor.<br><br>

# Make certain that you are located in your home directory.<br><br># Issue the following Linux command to edit a text file called '''othertext.txt''' in the '''linux/practice''' directory:<br><span style="color:blue;font-weight:bold;font-family:courier;">vi textedit/practice/othertext.txt</span><br><br>'''NOTE:''' When using the '''vi''' text editor, you are placed in '''COMMAND''' mode,<br>so you need to issue a command to switch to ''INPUT'' mode.<br><br>[[Image:vi-text-editor-a.png|right|200px|thumb|Enter the following text that appears in this diagram.]]# Type the following key to enter ''INPUT'' mode: <span style="color:blue;font-weight:bold;font-family:courier;">i</span><br><br>You should notice you are in ''INSERT'' mode by seeing the notification '''-- INSERT --'''<br>at the bottom left-hand side of the application screen.<br><br># Enter the line shown in the other diagram of the vi text editor on the right side.<br><br># While on the first line, press the following key to enter ''COMMAND'' mode: <span style="color:blue;font-weight:bold;font-family:courier;">ESC</span><br><br>You should see the ''-- INSERT --'' notification disappear indicating that you are in ''COMMAND'' mode.<br><br>'''NOTE:''' Refer to the table below for a list of<br>the most common '''vi''' ('''vim''') navigation &amp; editing commands:<br><br><table cellpadding="5"><tr><th style="border-bottom: 1px solid black;">Key(s)</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr><td style="font-family:courier">'''i'''</td><td>Enter '''INPUT''' mode</td></tr><tr><td style="font-family:courier">'''&lt;esc&gt;'''</td><td>Return to '''COMMAND''' MODE</td></tr><tr><td style="font-family:courier">'''x'''</td><td>Delete text to the right in COMMAND mode</td></tr><tr><td style="font-family:courier">'''W'''</td><td>Move forward one word in COMMAND mode</td></tr><tr><td style="font-family:courier">'''B'''</td><td>Move back one word in COMMAND mode</td></tr><tr><td style="font-family:courier">'''dd'''</td><td>Cut line in COMMAND mode</td></tr><tr><td style="font-family:courier">'''yy'''</td><td>Copy Line in COMMAND mode</td></tr><tr><td style="font-family:courier">'''p / P'''</td><td>Paste Cut/Copied Text below/above line in COMMAND mode</td></tr><tr><td style="font-family:courier">'''u'''</td><td>Undo previous editing command</td></tr><tr><td style="font-family:courier">''':help'''</td><td>Display help screen in COMMAND mode</td></tr><tr><td style="font-family:courier">''':x'''</td><td>Save editing changes and exit (in COMMAND mode)</td></tr><tr><td style="font-family:courier">''':w name'''</td><td>Save editing changes to "name" in COMMAND mode</td></tr><tr><td style="font-family:courier">''':q!'''</td><td>Abort editing session and exit (in COMMAND mode)</td></tr></table><br>Once you can get used to working in INPUT and COMMAND mode, it is easier to perform<br>text editing operations in '''vi''' via ''COMMAND'' mode as opposed to nano!<br><br># Type the following keys to <u>copy</u> the current line: <span style="color:blue;font-weight:bold;font-family:courier;">yy</span><br><br># Type the following key to <u>paste</u> the copied line: <span style="color:blue;font-weight:bold;font-family:courier;">p</span><br><br>What did you notice?<br><br># Type the following keys: <span style="color:blue;font-weight:bold;font-family:courier;">u</span><br><br>What did you notice?<br><br># Type the following keys: <span style="color:blue;font-weight:bold;font-family:courier;">3p</span><br><br>What did you notice?<br><br>[[Image:vi-text-editor-b.png|right|200px|thumb|Use a combination of '''arrow''' keys and the '''w''' and '''b''' keys while in COMMAND mode to change the correct words for the '''third''' and '''fourth''' lines.]]# Use the up or down '''arrow''' keys to move to the second line.<br><br># Type either the '''w''' and/or '''b''' keys to move the cursor to the beginning of the word: '''first'''.<br><br># Type the '''x''' keys to remove the word called '''first'''.<br><br># Type the '''i''' key to enter INSERT mode.<br><br># Type the word: '''second'''<br><br># Press the '''ESC''' key to enter COMMAND mode.<br><br># Repeat steps '''11''' to '''16''' to change the words for line number for lines '''3''' and '''4'''.<br><br># Move to the 4th line (i.e. last line).<br><br># Type the following keys: <span style="color:blue;font-weight:bold;font-family:courier;">dd</span><br><br>What did you notice?<br><br>Let's save editing changes and exit the vi text editor.<br><br># Type the following keys: <span style="color:blue;font-weight:bold;font-family:courier;">:x</span> and press '''ENTER'''<br><br>What did you notice?<br><br># Issue the same command that you performed in '''Step #2''' to confirm that you had properly edited that file.<br><br># '''Save''' and '''exit''' your vi editing session.<br><br>[[Image:vi-text-editor-2.png|right|250px|thumb|The online vi-tutorial provides users "hands-on" experience of using the vi text editor.]]An '''online tutorial''' has been created to give you "hands-on" experience on how to use vi text editor. It is <u>recommended</u> that you run this online tutorial in your Matrix account to learn how to create and edit text files with the vi text editor.<br><br># Issue the following to run the vi online tutorial:<br><span style="color:blue;font-weight:bold;font-family:courier;">/home/jason.carman/vi-tutorial<br><br># In the tutorial menu, select the first menu item labelled "'''USING THE VI TEXT EDITOR'''"<br><br>#Read and follow the instructions in the tutorial. Eventually, it will display a '''simulated''' vi environment<br>and will provide you with "'''hands-on'''" practice using the vi text editor. As far as this author is aware,<br>there is NO "hands-on" tutorial for the nano text editor in this particular format.<br><br># When you have completed that section, you will be returned to the main menu.<br>If you want to get extra practice, you can select the menu item labelled "'''REVIEW EXERCISE'''".<br><br># When you want to exit the tutorial, select the menu option to exit the tutorial.<br><br>

===Part 4: Removing Text Files ===xIt is recommended to try both text editors, and choose the text editor that you feel that is easier to use.<br><br>

# xMake certain that you are located in your home directory.<br><br># Refer to the following table of '''Text File Management Commands:'''<br><br><table cellpadding="5"><tr><th style="border-bottom: 1px solid black;" width="20%">Linux Command</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr><td style="font-family:courier">'''touch'''</td><td>Create empty file(s) / Updates Existing File's Date/Time Stamp</td></tr><tr><td style="font-family:courier">'''cat'''</td><td>Display text file's contents without editing (small files)</td></tr><tr><td style="font-family:courier">'''more , less'''</td><td>Display / Navigate within large text files without editing</td></tr><tr><td style="font-family:courier">'''cp'''</td><td>Copy text file(s)</td></tr><tr><td style="font-family:courier">'''mv'''</td><td>Move / Rename text files</td></tr><tr><td style="font-family:courier">'''rm'''</td><td>Remove text file(s)</td></tr><tr valign="top"><td style="font-family:courier">'''sort'''</td><td>Sorts (rearranges) order of file contents when displayed. Content is sorted alphabetically by default. The '''-n'''''Italic text'' option sorts numerically, '''-r''' performs a reverse sort</td></tr><tr valign="top"><td style="font-family:courier">'''head''' , '''tail'''</td><td>Displays the first / last 10 lines of a text file by default. An option using a value will display the number of lines (e.g. <span style="font-family:courier">head -5 filename</span> will display first 5 lines, <span style="font-family:courier">tail -5 filename</span> will display last 5 lines).</td></tr><tr valign="top"><td style="font-family:courier">'''grep'''</td><td>Displays file contents that match a pattern</td></tr><tr valign="top"><td style="font-family:courier">'''uniq'''</td><td>Displays identical consecutive lines only once</td></tr><tr valign="top"><td style="font-family:courier">'''diff''' file1 file2</td><td>Displays differences between 2 files</td></tr><tr><td style="font-family:courier">'''file'''</td><td>Gives info about the contents of the file (e.g. file with no extention)</td></tr><tr><td style="font-family:courier">'''find'''</td><td>To find files matching specified characteristics: <!-- <table><tr><td width="30%">'''<span style="font-family:courier">find . -name "file*"</span>'''</td><td>List pathname of any filenames beginning with "file",<br>from the current directory and any subdirectories</td></tr><tr valign="top"><td>'''<span style="font-family:courier">find . -size +50k</span>'''</td><td>List pathname of any files larger than 50 kb, from the current directory and any subdirectories</td></tr><tr valign="top"><td>'''<span style="font-family:courier">find . -mmin -5</span>''' </td><td>List files modified less than 5 minutes ago</td></tr><tr> valign="top"><td>'''<span style="font-family:courier">find -P .</span>'''</td><td>Lists file pathnames in the current directory</td></tr></table> --> </td></tr></table><br># Issue the following Linux command to create three <u>empty</u> text files in your current directory:<br><span style="color:blue;font-weight:bold;font-family:courier;">touch a.txt b.txt c.txt</span><br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">ls -l a.txt b.txt c.txt</span><br><br>Check the size in the detailed listing to confirm that these newly-created files are empty.<br><br>[[Image:vi-screen-40.png|right|300px|thumb|Nano text editor containing numbers '''1 to 40'''<br>on separate lines.]]# Use the '''nano''' text editor to edit the empty file called '''a.txt'''. <br><br>Type the number "'''1'''" and press '''ENTER'''. On the second line, type the number "'''2'''" and press '''ENTER'''.<br>Continue entering increasing number values until you reach the number '''40''' on line 40<br>(refer to the diagram on the right).<br><br># '''Save''' and '''exit''' your editing session.<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">cat a.txt</span><br><br>Can you see all of the contents?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">more a.txt</span><br><br>'''NOTE:''' The '''more''' command uses the same navigation keys as with the '''man''' command<br>(refer to week 1 notes for reference). Try using keys that you used to navigate the man pages.<br><br>What is the advantage of using the more command?<br><br># Type the letter "<span style="color:blue;font-weight:bold;font-family:courier;">q</span>" to exit the ''more'' command.<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">less a.txt</span><br><br>Is there any difference between the '''more''' and '''less''' commands?<br>(again press '''q''' to quit)<br><br># issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">sort a.txt</span><br><br>Why does the output not look what you expected? Why?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">sort -n a.txt</span><br><br>Try the same command using both the '''-n''' and '''-r''' options to see what happens.<br><br># issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">head a.txt</span><br><br>What is the output from this command display?<br><br># issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">head -7 a.txt</span><br><br>What is the output from this command display?<br><br># issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">tail a.txt</span><br><br>What is the output from this command display?<br>How would you issue this command to display only the '''last line''' contained in that file?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">grep 2 a.txt</span><br><br>What type of output appear? Why did these lines appear (what do they all have in common)?<br><br>[[Image:end-of-line.png|right|200px|thumb|Edit the '''a.txt''' file and add to the bottom 5 new lines each consisting of the <u>same</u> text: "'''end of line'''".]]# Edit the '''a.txt''' file and add to the bottom 5 new lines each consisting<br>of the <u>same</u> text: "'''end of line'''" (refer to diagram on right).<br><br># '''Save''' your editing session and '''exit''' your text editor.<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">uniq a.txt</span><br><br>What do you notice happened to those newly created lines?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">cp a.txt a.txt.bk</span><br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">cp a.txt b.txt</span><br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">mv a.txt aa.txt</span><br><br># Issue a Linux command to view the directory contents.<br><br>What happened to the file called '''a.txt'''? Why?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">file b.txt</span><br><br>What sort of information did it provide?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">diff aa.txt b.txt</span><br><br>Was there any output? If not, why?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">diff aa.txt c.txt</span><br><br> What do you think is the purpose of this output?<br><br># Issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">find -P . </span><br><br>What is the output of this command?<br><br># Issue the following Linux command:<br><span style="color:blue;font-weight:bold;font-family:courier;">rm aa.txt b.txt a.txt.bk c.txt</span><br><br># Issue the '''ls''' command to verify that these files have been removed.<br><br># Complete the '''LINUX PRACTICE QUESTIONS''' to get additional practice.

* https://ictwiki.cdot.senecacollege.ca/~murray.saululi101/uli101files/uli101_week2_practice.docx

[[Image:tree-diagram.png|right|350px|thumb|]]# Write a single Linux command to create the directory structure starting from your home directory from the diagram displayed on the right. # Write a Linux command to display a detailed listing of '''history'''directory.<br>How would this command differ if you wanted to also view hidden files as well?# Write a Linux command to change to the ''Review Questions'project''' directory.<br>What command would you issue to return to your home directory?# Write a Linux command to copy the '''project''' directory and its contents to the '''history''' directory.# Write a Linux command to move the directory called '''directories''' to the '''history''' directory.# Write a Linux command to remove both directories named '''1''' and '''2'''.# Write a Linux command to remove the '''concepts''' directory and its contents.# Write a Linux command to remove the '''concepts''' directory and prompt the user if they want to remove this directory’s contents.# Write a single Linux command to create the following empty files in the concepts directory:#* '''myfile.txt'''#* '''yourfile.txt'''#* '''thefile.txt'''# Write a Linux command to view the contents of the myfile.txt text file to prove it is empty. What is the difference between the commands: '''cat''', '''more''' and '''less'''?# Write a Linux command to sort the contents of a file called '''practice/customers.txt'''# Write a Linux command to display the first 4 lines of a file called '''practice/customers.txt'''# Write a Linux command to display the last line of a file called '''practice/customers.txt'''# Write a Linux command to match a line containing the pattern '''Linux''' in a file called '''practice/customers.txt'''# Write a Linux command to display unique occurrences of consecutive lines in a file called '''practice/customers.txt'''# Create a '''table''' listing each Linux command, useful options that are displayed near the top of this tutorial labelled: '''Tutorial Reference Material''' _________________________________________________________________________________ Author: Murray Saul License: LGPL version 3Link: https://www.gnu.org/licenses/lgpl.html