(Unix/Linux Lesson 3)

{ clear, echo, >, >> (append), cat, sort, uniq }

1. Login to your TargetUbuntu01 Server, or whatever server you can practice on. 
2. For the purposes of this lab, login as the student username or a username for which you have access.
3. Do all work in your home directory.

1. clear
2. echo "Basketball\nBaseball" > sports.txt
   • echo - is used to display a line of text
     • <Example>:  echo "Whatever you want to type"     #Remember to use the "quotes"
   • \n  - produces and end of line character or a hard return that puts Baseball on the line below Basketball.
   • > - Is a redirection operator.
     • In the above command on line number 2, we are redirecting the string phrase "Basketball\nBaseball" into a file called sports.txt.
3. cat sports.txt
   • This displays the results of the above echo command on line #2.

1. clear
2. echo "Football\nUFC" >> sports.txt
   • >> - appends the contents of the above echo command to the already created file sports.txt
3. cat sports.txt
   • This displays the results of the above echo command on line #2.

1. clear
2. cp sports.txt sports.txt.nuke
   • Make a copy of the sports.txt file, which will is called sports.txt.nuke
3. cat sports.txt.nuke
   • Issue the cat command, to see the contents of the file.
4. > sports.txt.nuke
   • The ">" operator is a very powerful and dangerous tool.
   • The ">" operator empties out the contents of the file, leaving you with a zero-byte, zero-line file in which you have not undo option.
5. cat sports.txt.nuke

1. clear
2. echo "Gateraide\nPoweraide" > drinks.txt
   • Create another file called drinks.
3. cat drinks.txt
4. cat sports.txt drinks.txt > combined_file.txt
   • Here we are using cat to create one file called combined_file.txt from the contents of both sports.txt and drinks.txt.
5. cat combined_file.txt

1. clear
2. echo "Basketball\nBasketball" >> combined_file.txt
   • Add the contents of echo to the file named combined_file.txt
3. cat combined_file.txt
   • See the contents
4. sort combined_file.txt > sorted_file.txt
   • Sort alphabetically the contents of combined_file.txt
   • Create a new file named sorted_file.txt using the ">" operator
5. cat sorted_file.txt

1. clear
2. cat combined_file.txt | uniq
   • Display the contents of combined_file.txt.
   • Then remove all duplicate lines using the "uniq" command.

1. clear
2. sort combined_file.txt | uniq -c
   • Sort the contents in combined_file.txt
   • Count the number of occurence
     • Notice, Basketball has a number 3 in front of the word, because there were 3 occurrences of the word "Basketball" in the file combined_file.txt
3. sort combined_file.txt | uniq
   • Sort and Display the contents of combined_file.txt.
   • Then remove all duplicate lines using the "uniq" command.

1. clear
2. sort combined_file.txt | uniq > uniq_file.txt
   • Sort the contents in combined_file.txt
   • Make the contents unique with no duplicates
   • Create a file using the ">" called uniq_file.txt
3. cat uniq_file.txt

1. clear
2. cat combined_file.txt | uniq -d
   • Display the contents called combined_file.txt
   • Use the "-d" flag of uniq to display only duplicate lines

1. clear
2. ls -lrta | grep `date +%Y-%m-%d`
   • Do a long listing of all files sort in reverse order by time
   • Using grep to only display files created today.
3. Capture the screen by the <Alt> button and <PrtScn> button at the same time.
4. Paste the screen in a word document
5. Upload to Moodle Lab 7 A.