CSC3320 - System Level Programming - Lab Assignment 4 - Part 1 - In- Lab - Solved

 Practices on the grep family commands to process texts in files. 



1)       $more  CSC_Course.txt 

 Check the content of "CSC_Course.txt" using more. 

Note: When viewing the file, you may need to use command f (forward one screen), b (backward one screen) and q(quit). 

 

2)        $grep 'CSC 3320' CSC_Course.txt 

 Note: there is a single space between "CSC" and "3320" 

Output the lines containing the string "CSC 3320"(search the course the number of which is "CSC 3320") 

 

3)        $grep -i 'CSC 3320' CSC_Course.txt 

Output the lines containing the string "CSC 3320" via ignoring case (search the information related to CSC3320) 

 

4)        $ grep 'CSC 3' CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

 

 

1 

5)         $ grep 'CSC 3|CSC 1' CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

 

6)         $ grep -E 'CSC 3|CSC 1' CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

Use extend regular expression
 

7)         $ egrep 'CSC 3|CSC 1' CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

 

 

8)         $ fgrep '3.000 Credit hours' CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

 

9)         $ fgrep -x '3.000 Credit hours' CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

Only match the whole line  
 

10)           $ grep 'CSC.*Programming' CSC_Course.txt 

 

Attach a screenshot of the output and describe what this command does. 

 

11)           $ grep '^CSC.*Programming$' CSC_Course.txt 

 

Attach a screenshot of the output and describe what this command does. 

 

12)           $ grep --color 'CSC[^3]*3{2}' CSC_Course.txt 

 

Attach a screenshot of the output and describe what this command does. 

No result, {} is not a special character
13) $ egrep --color -w 'CSC[^3]*3{2}[^3]*' CSC_Course.txt 

 

Attach a screenshot of the output and describe what this command does. 

-w Select only those lines  containing matches that form whole words. 

 

14) $ grep 'CSC.*C++' CSC_Course.txt 

 

Attach a screenshot of the output and describe what this command does. 

+  is not a special character in basic regular expression
 

15)          $ egrep 'CSC.*C\+\+' CSC_Course.txt 

 

Attach a screenshot of the output and describe what this command does. Convert + 

 

16)          $ egrep 'CSC.*C++' CSC_Course.txt 

 

Please only describe what this command does. 

 
Optional Part: 

  1) $ sed -E -n 's/(CSC 3[0-9]{3})(.*)/\1/p'   CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

 

 2)$ awk -F'-' '/(CSC  3[0-9]{3})(.*)/{print $1}'   CSC_Course.txt  Attach a screenshot of the output and describe what this command does. 

 

3)        $ sed -E -n 's/(CSC [0-9]{4})( - )(.*)/\3/p'   CSC_Course.txt 

Attach a screenshot of the output and describe what this command does. 

 

4)         $ sed -E -n 's/(CSC [0-9]{4})( - )(.*)/\3/p' CSC_Course.txt| sort 

Attach a screenshot of the output and describe what this command does