Guide to Linux+
ISBN 0-619-21621-2
End of Chapter Solutions

Chapter 3 Solutions

Review Questions

1. What is the default shell in Linux called? a. SH b. BSH c. CSH d. BASH Answer: d 2. What equivalent to the man command generally provides an easier-to-read description of the queried command and also contains links to other related information? a. who b. man help c. man -descriptive d. info Answer: d 3. What command can you use to safely shut down the Linux system immediately? a. shutdown -c b. shutdown -r c. down d. halt Answer: d 4. What command is equivalent to the man –k keyword command? a. find keyword b. man keyword c. apropos keyword d. appaloosa keyword Answer: c 5. The Red Hat Fedora installation can be performed in which two of the following modes? a. text b. full c. subtext d. graphical e. administrator assisted Answer: a,d 6. Linux commands entered via the command line are not case sensitive. True or False? Answer: False 7. Which command blanks the terminal screen erasing previously displayed output? a. erase b. clean c. blank d. clear Answer: d 8. When sitting at a computer running Linux, what key combination is pressed to open the graphical terminal? a. Ctrl+Alt+F1 b. Ctrl+Alt+7 c. Ctrl+Alt+F7 d. Ctrl+7 Answer: c 9. After a user logs in to a terminal, he receives a user interface called a _________. a. GUID b. shell c. text box d. command screen Answer: b 10. Users enter commands directly to the kernel of the Linux operating system. True or False? Answer: False 11. How can you protect a metacharacter (such as the $ character) from shell interpretation? a. Precede it with a /. b. Follow it with a \. c. Precede it with a $. d. It cannot be done as metacharacters are essential. e. Precede it with a \. Answer: e 12. You know a Linux command will perform a desired function for you, but you cannot remember the full name of the command. You do remember it will flush a variable from your system. Which command typed at a command prompt displays a list of commands that would likely contain the command you desire? a. man –k flush b. man –k find all c. man flush d. man –key flush Answer: a 13. Which command displays the users who are currently logged in to the Linux system? a. finger b. who c. id d. date Answer: b 14. Which of the following packages can be used to standardize configuration files across Linux systems? a. Samba b. Apache c. NIS d. NFS Answer: c 15. Which prompt does the root user receive when logged in to the system? a. $ b. @ c. # d. ! Answer: c 16. Which prompt do regular users receive when logged in to the system? a. $ b. @ c. # d. ! Answer: a 17. Which installation screen only appears if certain hardware is detected by the installation program? a. firewall configuration b. network configuration c. boot loader configuration d. X Windows customization Answer: b 18. Which two partitions do you typically create at minimum during a Red Hat Fedora Linux installation? a. / b. /boot c. swap d. /home Answer: a, c 19. If you are planning to install 2.3Gb of packages when installing your Linux server, how much free space should you have on your hard disk to create the necessary filesystems? a. 2.3Gb b. 3 Gb c. 3.5 Gb d. 4.6 Gb Answer: d 20. Which boot loader is available to choose from during the installation of Red Hat Fedora? a. LILO b. ABOOT c. GRUB d. TeX Answer: c
Hands-on Projects

Project 3-1
Not available.

Project 3-2
Step 1: The # prompt as it is the standard prompt for the root user.
Step 2: The shell is case sensitive; Date is not a valid command name. The error message came from the shell.
Step 3: The $ prompt as it is the standard prompt for regular user accounts.
Step 4: The root user is logged in to tty2 and user1 is logged in to tty5.
Step 5: No, the session is kept active even if the user is not interacting with it.
Step 6: The exit command ends the shell and returns you to a login prompt.
Step 7: Not available.

Project 3-3
Step 1: The GNOME desktop is the default in Red Hat Linux.
Step 2: The # prompt as it is the standard prompt for the root user.
Step 3: The root user is logged in to :0.
Step 4: Not available.
Step 5: Not available.
Step 6: The $ prompt as it is the standard prompt for regular user accounts.
Step 7: Yes.
Step 8: Not available.

Project 3-4
Step 1: Not available.
Step 2: The ; character acts as a command terminator allowing you to enter more than one command on the command line before execution.
Step 3: Not available.
Step 4: The single quote character needs protection.
Step 5: Don’t do this.
Step 6: Don’t do this.
Step 7: /bin/bash was displayed first; nothing was displayed second.
Step 8: You have .50—you can protect $ using single quotation marks or a backslash character.
Step 9: You have $4.50.
Step 10: You have .50.
Step 11: You have $4.50.
Step 12: My name is root—the backquotes perform command substitution.
Step 13: Not available.

Project 3-5
Step 1: Not available.
Step 2: There are two different manual pages for crontab (command and file format).
Step 3: Not available.
Step 4: Not available.
Step 5: Not available.
Step 6: Not available.
Step 7: Not available.
Step 8: Not available.
Step 9: The halt command.

Discovery Exercises

Discovery Exercise 1
Answers will vary. The command used is man –k copy or apropos copy. Commands that only the root user can execute are indicated with (8) and there are several of them. The remainder of this Discovery Exercise will vary.

Discovery Exercise 2
The correct commands are: echo “This command does not work properly” (echo must be spelled with a lowercase e) date (the date command does not take a -z option) apropos man (the apropos and man –k commands are identical man –k man in function but are separate commands) man date (date is not a shell function – cannot use help) finger root (the route user does not exist, yet the root user does) shutdown –h now (the –c option to shut down cancels a shutdown; shutdown –r now however, the –h and –r options can be used to reboot or halt) echo ‘I would like lots of $$$’ (the $ character is a shell metacharacter that needs to be protected) man 1 date (date is in section 1 of the manual pages)