Introduction to Linux II – Chapter 08 Exam Answers 100% PDF file

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1. The daemon associated with the cron utility is called the ___________ daemon.

cdaemon
crondaemon
crond
cron

2. The crontab command can be used to:

Create crontab files
Remove crontab files
List crontab files
All choices are valid

3. System crontabs are generally found in which of the following directories?

/root; /etc
/var/spool/cron; /etc/cron.d
/etc; /bin
/var/spool/cron.d; /etc/cron

4. All commands that are run from system crontabs require root privileges.
True or False?

True
False

5. Commands specified in a crontab file will run only if the root user is logged in.
True or False?

True
False

6. In the time fields of a crontab file entry, a _________is used to denote a range of values.

7. The crontab keyword @reboot implies that the job runs:

Once, at startup
Once a day
Every time a user logs in
Each time the crond daemon starts

8. The system administrator wants to create a crontab entry to perform daily backups. Which of the following keywords should be used?

@today
@daily
@backup
Cannot be done

9. The system administrator wants to check the status of a database every hour. Which of the following crontab entries will ensure that the script runs every hour (on the hour) from 8AM to 5PM, Monday through Friday?

00 08-17 * * 1-5 /home/appuser/bin/check-db-status
00 08-05 * * 1-5 /home/appuser/bin/check-db-status
00 08-17 * * 00 /home/appuser/bin/check-db-status
00 08-17 * * 5 /home/appuser/bin/check-db-status

10. Which of the following commands can be used to view the current contents of a crontab file?

crontab –l
crontab –p
crontab –r
crontab –v

11. Which of the following commands can be used to remove all the crontab entries?

crontab –r *
crontab –v
crontab –l
crontab –p

12. Refer to following cron job entry:0 9-18 * * * /home/joe/bin/check-db-statusThe job…

Executes check-db-status on all days between 9 AM and 6 PM
Executes check-db-status Monday to Friday between 9 AM and 6 PM
Executes check-db-status at every hour on all days
Executes check-db-status at every hour on Monday to Friday

13. How would you schedule a cron job to run every second?

By using the keyphrase @second
Create 60 jobs which run every minute
Using a cron job, it is not possible to schedule a job which runs every second
By putting an entry similar to * * * * * <job>

14. A Linux server, configured for the UTC time zone, is accessed by users from other time zones. The cron jobs scheduled on the server will run:

As per the time zone of location where the server is kept
As per the time zone of respective users
As per UTC time zone
As per the TZ environment variable setting in the crontab file

15. The crond daemon can be restarted using the command /etc/init.d/crond restart

False
True

16. The system administrator wants to allow certain users to access the crontab command but not others. This can be done by:

Add account name(s) to have access in the system crontab file
Selective access is not possible
Granting them root privileges
Managing entries in cron.allow and cron.deny files

17. A Linux system has entries in both the cron.allow and cron.deny files. Which users, other than root, will have access to the crontab command?

Users specified in cron.allow have access to crontab; cron.deny will be ignored
Only root will have access to crontab
All users except those specified in the cron.deny file will have access to crontab
Users specified in cron.allow but not included in cron.deny will have access to crontab

18. Only 5 out of 100 Linux users in ABCajun Corp need access to crontab. The administrator should:

Create cron.deny and add all the users in the file
Create cron.allow and add those five users to the file
Create cron.deny and add those five users in the file
Create both cron.allow and cron.deny files. Add five users in cron.allow and remaining ninety five in cron.deny

19. A Linux server may not be powered-on all the time. Which of the following options is most suitable to run scheduled jobs on this server?

anacron
cron
cron.allow
cron jobs with only daily jobs

20. What does the delay field in an anacrontab entry signify?

The command should wait for a specified number of minutes after running the previous command
The command should delay the processing by a specified number of minutes
The command should wait for a specified number of seconds after the machine starts
The command should wait for a specified number of minutes after the machine starts

21. To force a job to be run irrespective of its timestamp, the anacron command can be used with which of the following options?

–n
–f
–s
–u

22. The cron scheduler should be used if the jobs are to be run at a particular hour and minute.True or False?

True
False

23. A one-time job needs to be scheduled for a specific time. Which of the following commands is most suitable for the task?

at
anacron
cron
batch

24. Pam wants to schedule a one-time task using the at command and receive an email once it is complete. Which of the following at command options should she use?

–m
–f
–v
–x

25. After executing the atq command, the following jobs are displayed:
2 2014-11-22 22:00 a test_user
3 2014-11-22 20:00 a root
4 2014-11-22 22:45 a oracle_dba
Which of the following commands will delete job #2?

atrm test_user
test_user should manually delete the entry
atrm 2
at -r 2

26. The at.allow and at.deny files can be used to control access to:

at and batch commands
anacron
at command only
All programs used for scheduling

27. Rob has to schedule a job to accomplish a one-time task. He wants to run the job during off-peak hours only. Which of the following is most suitable to schedule this task?