- (Exam Topic 3)
A user accidentally created the subdirectory dir in his home directory. Which of the following commands will remove that directory?

1. A. rmdir '~/\dir'
2. B. rmdir "~/\dir"
3. C. rmdir ~/'dir'
4. D. rmdir ~/\dir
5. E. rmdir ~/\\dir

Correct Answer: E

- (Exam Topic 3)
Which character, added to the end of a command, runs that command in the background as a child process of the current shell?

1. A. !
2. B. +
3. C. &
4. D. %
5. E. #

Correct Answer: C

- (Exam Topic 3)
Which of the following commands will reduce all consecutive spaces down to a single space?

1. A. tr '\s' ' ' < a.txt > b.txt
2. B. tr -c ' ' < a.txt > b.txt
3. C. tr -d ' ' < a.txt > b.txt
4. D. tr -r ' ' '\n' < a.txt > b.txt
5. E. tr -s ' ' < a.txt > b.txt

Correct Answer: E

- (Exam Topic 3)
Regarding the command: nice -5 /usr/bin/prog
Which of the following statements is correct?

1. A. /usr/bin/prog is executed with a nice level of -5.
2. B. /usr/bin/prog is executed with a nice level of 5.
3. C. /usr/bin/prog is executed with a priority of -5.
4. D. /usr/bin/prog is executed with a priority of 5.

Correct Answer: B

- (Exam Topic 5)
Which of the following vi commands deletes two lines, the current and the following line?

1. A. d2
2. B. 2d
3. C. 2dd
4. D. dd2
5. E. de12

Correct Answer: C