Guide to Linux+ (2nd Edition) ISBN 0-619-21621-2 End of Chapter 10 Solutions

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Chapter 10 Solutions
Review Questions

1. Which command entered without arguments is used to display a list of processes running in the current shell?
a. ppid
b. list
c. pid
d. ps

2. Which of the following statements is true? (Choose all that apply.)
a. If /etc/at.allow exists, only users listed in it can use the at command.
b. If /etc/cron.allow exists, only users listed in it can use the cron command.
c. If /etc/cron.deny exists and /etc/cron.allow does not exist, any user not listed in /etc/cron.deny can use the cron command.
d. If /etc/cron.allow and /etc/cron.deny exist, only users listed in the former can use the cron command and any listed in the latter are denied access to the cron command.
e. If a user is listed in both /etc/cron.allow and /etc/cron.deny, then /etc/cron.deny takes precedence and the user cannot access the crontab command.

3. Where are individual user tasks scheduled to run with the cron daemon stored?
a. /etc/crontab
b. /etc/cron/(the user’s login name)
c. /var/spool/cron
d. /var/spool/cron/(the user’s login name)

4. Which process will always have a PID of 1 and a PPID of 0?
a. the kernel itself
b. ps
c. init
d. top

5. The term used to describe a process spawning or initiating another process is referred to as_____.
a. a child process
b. forking
c. branching
d. parenting

6. As daemon processes are not associated with terminals, you must use the –e switch with the ps command to view them. True or False?

7. Which of the following commands will most likely increase the chance of a process receiving more time slices?
a. renice 0
b. renice 15
c. renice -12
d. renice 19

8. How can you bypass the wait function and send a user process to the background?
a. This cannot happen once a process is executing; it can only be done when the command is started by placing an ampersand (&) after it.
b. This cannot happen; only daemon processes can run in the background.
c. You can use the ps command.
d. You can use the Ctrl+z key combination and the bg command.

9. The at command is used to _______________.
a. schedule processes to run periodically in the background
b. schedule processes to run periodically on a recurring basis in the future
c. schedule processes to run at a single instance in the future
d. schedule processes to run in the foreground

10. What command is used to view and modify user jobs scheduled to run with cron?
a. crontab
b. cron
c. ps
d. sched

11. Every process has a process ID and a_______.
a. fork process
b. daemon
c. child process
d. parent process ID

12. The killall command terminates _________.
a. all instances of a process with the same PPID
b. all instances of a process with the same PID
c. all instances of a process with the same priority
d. all instances of a process with the same name

13. Nice values are used to affect process priorities using a range between _____________.
a. 0 and 20
b. 0 and -19
c. –19 and 20
d. –20 and 19

14. What is the name given to a process not associated with a terminal?
a. child process
b. parent process
c. user process
d. daemon process

15. To kill a process running in the background, you must place a % character before its process ID. True or False?
Answer: False
16. What kill level signal cannot be trapped?
a. 1
b. 9
c. 3
d. 15

17. A runaway process that is faulty and consuming mass amounts of system resources ________.
a. is a zombie process
b. is an orphaned process
c. has a PPID of Z
d. is a rogue process

18. When you run the ps command, how are daemon processes recognized?
a. The terminal is listed as tty0.
b. There is a question mark in the TTY column.
c. There is an asterisk in the STIME column.
d. There is a “d” for daemon in the terminal identification column.

19. Which command is used to gain real-time information about processes running on the system with the most processor-intensive processes listed at the beginning of the list?
a. ps
b. ps -elf
c. top
d. top -l

20. Which command can be used to see processes running in the background?
a. bg
b. jobs
c. ps -%
d. fg

Project 10-1
Project 10-2
Project 10-3
Project 10-4
Project 10-5
Project 10-6

Discovery Exercises
Discovery Exercise 1
Discovery Exercise 2
Discovery Exercise 3
Discovery Exercise 4
Discovery Exercise 5

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