Linux Essentials Chapter 8 Exam Answer 2016

1. Error messages generated by commands are sent where by default?

• Log files
• STDOUT
• STDERR
• STDIN

2. A successful command will print output to STDOUT.. True or False?

• True
• False

3. Which of the following commands will direct error messages to the file, error.log?. (choose one)

• ls /root >> error.log
• ls /root 2> error.log
• ls /root $> error.log
• ls /root > error.log

4. A pipe allows you to…

• …send the same input to multiple commands.
• …type multiple commands at one prompt.
• …send the output of one command to another.
• …send the output of a command to a file.

5. Channel 2 is:

• STDIN
• STDALL
• STDOUT
• STDERR

6. Which of the following commands will append its output to output.file?

• echo Testing > output.file
• echo Testing >> output.file
• output.file < echo Testing
• echo Testing -> output.file

7. Which command(s) can be used to sort the lines of list.file alphabetically and display it on the screen?. (choose two)

• sort < list.file
• cat list.file | sort
• cat list.file >> sort
• echo list.file > sort

8. Which option of the head command will display only the first five lines of a file?

• -l 5
• No option needed; head displays only five lines by default.
• -n
• -n 5

9. The grep command…

• …will display all the lines that begin with the specified Regular Expression.
• …is not case sensitive.
• …will display all the lines in a file containing the specified Regular Expression.
• …will display the line numbers in a file that contain a specified Regular Expression.

10. The grep command can be used with glob characters.. True or False?

• True
• False

11. Which of the following commands will display only lines that begin with start?

• grep *start file.txt
• grep $start file.txt
• grep start file.txt
• grep ^start file.txt

12. Which of the following commands will display only lines that begin with test?

• grep ^test file.txt
• grep $test* file.txt
• grep *test file.txt
• grep &test file.txt

13. Which of the following commands will display lines that contain either start or end?

• egrep start end file.txt
• egrep ‘start|end’ file.txt
• egrep start&end file.txt
• egrep (start|end) file.txt

14. Which of the following commands can be used to scroll through a text file?. (choose two)

• some
• less
• cat
• more

15. The find command can search for files based on the size of the file.. True or False?

• True
• False

16. Which of the following commands scans the file to determine file locations?

• search
• locate
• where
• find

17. Which option for the cut command is used to specify a delimiter?

• -f
• -d
• =
• -D

18. Which option for the cut command is used to specify the field?

• -D
• -f
• -d
• #

19. Which option for the wc command will print the number of lines in a file?

• -l
• -w
• -C
• -L

20. Which option for the wc command will print the total number of words in a file?

• -l
• -L
• -C
• -w

21. Which command can be used to print line numbers?

• num
• sort
• ln
• nl

22. The command echo “text” > file.txt will create file.txt if it does not already exist.. True or False?

• True
• False

23. The command echo “text” > file.txt will not overwrite file.txt if it already exists.. True or False?

• True
• False

24. The command echo “text” >> file.txt will not overwrite file.txt if it already exists.. True or False?

• True
• False