Name:

class section:

Using your browser, save a copy of http://www.linux-classes.com/ccis1121/labs/lab3.datafile into your /tmp directory. Using that datafile, you can complete all questions on this worksheet. Write the correct answer after each question.

1. Create a user for the instructor. Username jeremy with password in_class. Make sure that user jeremy is in the wheel group. Get instructor sign-off
2. using grep, pick out all the lines containing 134.29 from the sample file:

   
   

3. Invert the answer to the above question. That is, pick out all the lines which do NOT contain 134.29
   

4. Now display all lines which contain the word work:
   

5. Now display all lines which contain the word server:
   

6. Display all the lines which contain the word workstation:
   

7. If the answers to #6 and #8 did not produce the same result, explain why:
   

   
   

8. (3 points) What 3 symbols redirect standard output (also known as STDOUT)?
   

9. Using a pipe, alter the answer to #6 such that it is sorted by the first column
   

10. Using a pipe, alter the answer to #6 such that it is sorted numerically by the second column
    

11. Using a pipe, alter the answer to #6 such that it is reverse sorted numerically (that is, 5 would come before 4) by the third column
    

12. remove all duplicate entries from the answer to the previous question:
    

13. Use awk to display the first two columns of data from the datafile:
    

14. Modify the answer to the previous question such that it is sort by the first column:
    

15. Modify the answer to the previous question such that all duplicates are removed:
    

16. Now, use the wc command to determine how many lines of data are produced:
    

17. Now, use the wc command to print ONLY the number of lines of data are produced:
    

18. How many lines of data were produced?
19. Show the command to find all files on the system which are sockets (type s):
    

20. Show the command to find all files on the system owned by user jeremy:
    

21. Alter the above question so that all error messages are discarded:
    

22. Alter the answer from the previous question so that the results are redirected into the file /tmp/jeremy.out:
    

23. Alter the answer from the previous question so that all error messages are redirected into the file /tmp/jeremy.err: