Which of the following possibilities is only available when using open source software?

1. A. Download of all its existing versions.
2. B. Free use.
3. C. Access to its detailed help manual.
4. D. Access to its source code.

Correct Answer: D

When creating a new file, what can be done to make the file hidden from the default output of the ls command?

1. A. Hide the file with a name commented out with a hash sign like #foobar.txt.
2. B. Hide the file with a name beginning with a period like .foobar.txt.
3. C. Hide the file with chvis +h filename.
4. D. Hide the file with chmod a+h filename.
5. E. Hide the file with hide filename.

Correct Answer: B

Which of the following command sequences overwrites the file foobar.txt?

1. A. echo "QUIDQUIDAGIS" >> foobar.txt
2. B. echo "QUIDQUIDAGIS" < foobar.txt
3. C. echo "QUIDQUIDAGIS" > foobar.txt
4. D. echo "QUIDQUIDAGIS" | foobar.txt

Correct Answer: C

Which of the following is an example of globbing?

1. A. ls /etc/ 2> files.txt
2. B. ls /etc/ > files.txt
3. C. ls /etc/*.txt
4. D. ls /etc/ | more

Correct Answer: C

Which of the following is a valid option for a typical command to get its built-in usage information?

1. A. -?
2. B. -H
3. C. help
4. D. --manual
5. E. –help

Correct Answer: E