Changes

Tutorial2: Unix / Linux File Management

1,827 bytes added, 03:57, 24 January 2020

→‎Tutorial Reference Material

|- valign="top" style="padding-left:15px;"

|colspan="1" |~~Course Notes~~Slides:<ul><li>[https://ict.senecacollege.ca/~uli101/notes/Week02.pdf PDF] | [https://ict.senecacollege.ca/~uli101/notes/Week02.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 (PDF)]</li><li>[http://czegel.com/seneca/uli101/lectures/Lecture2.html Les Czegel's Week 2 Notes (HTML)]</li></ul>

*[http://man7.org/linux/man-pages/man1/cat.1.html cat]

*[http://man7.org/linux/man-pages/man1/more.1.html more] , [http://man7.org/linux/man-pages/man1/less.1.html less]

* [http://man7.org/linux/man-pages/man1/head.1.html head] , [http://man7.org/linux/man-pages/man1/tail.1.html tail]

*[http://man7.org/linux/man-pages/man1/touch.1.html touch]

*[http://man7.org/linux/man-pages/man1/file.1.html file]

|}

= KEY CONCEPTS=

===Unix / Linux Directories===

# Issue the following Linux command to confirm that all of the directories have been created: ls -ld uli101 uli101/notes uli101/tutorials uli101/examples acp100 xyz100

'''~~Downloading &~~ Running a Shell Script to Check your Work'''

Although you are being asked to create the directory structure, you might have made some mistakes: For Example:

# Make certain that your current directory is '''your home directory'''.

# Issue the following Linux command to ~~'''download'''~~ run a ~~'''shell~~ checking script~~''' to your home directory that will check your work~~: ~~wget https:~~bash /home/~~matrix.senecacollege.ca/~~~murray.saul/~~uli101/week1-check-1<~~scripts/~~span> # Run the checking script to check your work by issuing the following: bash week1~~week2-check-1

# 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 the next section.

#Issue the following Linux command to display the directory structure of your home directory to confirm you copied the uli101 directory: tree Let's download and run a checking script to see if you moved and copied the directories correctly.

# Make certain that your current directory is '''your home directory'''.

# Issue the following Linux command ~~to '''download''' a '''shell~~ run checking script~~''' to your home directory that will check your work~~: ~~wget https:~~bash /home/~~matrix.senecacollege.ca/~~~murray.saul/~~uli101~~scripts/~~week1~~week2-check-2 # ~~Run the checking script to check your work by issuing the following: bash week1-check-2 ~~If you encounter errors and re-run the checking script until you receive a congratulations message, and proceed to the next section.

===Part 3: Removing Directories ===

# Issue the following Linux command (entering "y" when prompted): rm -ri xyz100 '''NOTE:''' You should have removed all directories that you have created. Let's download and run a checking script to see if you have removed all of the directories that you earlier created.

# Make certain that your current directory is '''your home directory'''.

# Issue the following Linux command to ~~download~~ run a ~~'''shell~~ checking script~~''' to your home directory that will check your work~~:~~ ~~~~wget https:~~bash /home/~~matrix.senecacollege.ca/~~~murray.saul/~~uli101~~scripts/~~week1~~week2-check-3 # ~~Run~~ If you encounter errors and re-run the checking script until you receive a congratulations message, and proceed to ~~check your work by issuing~~ the ~~following: bash week1-check-3~~next INVESTIGATION.

=INVESTIGATION 2: MANAGING TEXT FILES=

'''Perform the Following Steps:'''

# View the following table of Text File Management commands Your instructor should have demonstrated in class how to use these commands): <table cellpadding="5"><tr><th style="border-bottom: 1px solid black;">Linux Command</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr><td>'''touch'''</td><td>Create empty file(s) / Updates Existing File's Date/Time Stamp</td></tr><tr><td>'''cat'''</td><td>Display text file's contents without editing (small files)</td></tr><tr><td>'''more , less'''</td><td>Display / Navigate within large text files without editing</td></tr><tr><td>'''cp'''</td><td>Copy text file(s)</td></tr><tr><td>'''mv'''</td><td>Move / Rename text files</td></tr><tr><td>'''rm'''</td><td>Remove text file(s)</td></tr><tr valign="top"><td>'''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>'''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. head -5 filename will display first 5 lines, tail -5 filename will display last 5 lines).</td></tr><tr valign="top"><td>'''grep'''</td><td>Displays file contents that match a pattern</td></tr><tr valign="top"><td>'''uniq'''</td><td>Displays identical consecutive lines only once</td></tr><tr valign="top"><td>'''diff''' file1 file2</td><td>Displays differences between 2 files</td></tr><tr><td>'''file'''</td><td>Gives info about the contents of the file (e.g. file with no extention)</td></tr><tr valign="top"><td>'''find'''</td><td>To find files matching specified characteristics:<table><tr valign="top"><td width="20%">'''find . -name "file*"'''</td><td>List pathname of any filenames beginning with "file", from the current directory and any subdirectories</td></tr><tr valign="top"><td>'''find . -size +50k'''</td><td>List pathname of any files larger than 50 kb, from the current directory and any subdirectories</td></tr><tr valign="top"><td>'''find . -mmin -5''' </td><td>List files modified less than 5 minutes ago</td></tr><tr> valign="top"><td>'''find -P .'''</td><td>Lists file pathnames in the current directory</td></tr></table></td></tr></table>

# Make certain that you are located in your '''home''' directory.

# Use the '''touch''' command to create the empty files called '''a.txt''', '''b.txt''', and '''c.txt'''

# Type the letter "q" to exit the more command.

# Issue the following Linux command: less a.txt Is there any difference between the more and less commands? (again press '''q''' to quit)

# issue the following Linux command: sort a.txt Why does the output not look what you expected? Why?

# Issue the following Linux command: sort -n a.txt Try the same command using both the '''-n''' and '''-r''' options to see what happens.

# issue the following Linux command: head a.txt What is the output from this command display?

# issue the following Linux command: head - 7 a.txt What is the output from this command display?

# issue the following Linux command: tail a.txt What is the output from this command display? How would you issue this command to display only the last line contained in that file?

# Issue the following Linux command: grep 2 a.txt What type of output appear? Why did these lines appear (what do they all have in common)?

# Edit the '''a.txt''' file and add to the bottom 5 new lines each consisting of the same text: "'''end of line'''" and save changes to your file.

# Issue the following Linux command: uniq a.txt What do you notice happened to those newly created lines?

# Issue the following Linux command: cp a.txt a.txt.bk

# Issue the following Linux command: cp a.txt b.txt

# Issue one of the commands you learned to display the contents of the file called '''b.txt''' without editing. What happened to this file?

# Issue the following Linux command: mv a.txt aaa.txt~~.bk~~

# Issue a Linux command to view the directory contents. What happened to the file called '''a.txt'''? Why?

# Issue the following Linux command: file b.txt What sort of information did it provide?

# Issue the following Linux command: diff aaa.txt~~.bk~~ b.txt What was the output? Why do you think caused the result of this output? # Issue the following Linux command: diff aaa.txt~~.bk~~ c.txt What reason would this type of output occur?

# Issue the following Linux command: find -P . What is the output of this command?

# Issue the following Linux command: rm aa.txt b.txt a.txt.bk c.txt # Issue the '''ls ''' command to verify that these files have been removed. # After you complete the Review Questions sections to get additional practice, then work on your online assignment#1, section 2 labelled "Basic Unix Commands" (parts '''4''' to '''6''') in this section which are respectively labelled: '''Managing Files''' , '''Accessing Files''' and '''Review Exercise'''.

= LINUX PRACTICE QUESTIONS =

# Write a Linux command to display unique occurrences of consecutive lines in a file called '''uli101/customers.txt'''

# Create a '''table''' listing each Linux command, useful options that are displayed near the top of this tutorial labelled: '''Tutorial Reference Material'''

[[Category:ULI101]]

Msaul

Administrators

13,420

edits

Changes

Tutorial2: Unix / Linux File Management

Navigation menu

Personal tools

Namespaces

Variants

Views

More

Search

Navigation

get involved with CDOT

courses

course projects

links

Tools