Linux Computing. Linux Questions Advanced 2021.pdf

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Advanced Linux Questions
Linux Computing
This book is for sale at
http://leanpub.com/linuxquestions-advanced
This version was published on 2019-03-15
This is a
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book. Leanpub empowers authors and
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© 2019 Linux Computing
Contents
Part I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Part I
QUESTION
Which two utilities can you use to set up a job to run at a specified
time?
1
2
3
4
at and crond
atrun and crontab
at and crontab
atd and crond
Correct Answer: C
Explanation: The ‘at’ command is used to execute commands at a
specified time and optional date. A cron job is a program or script
scheduled at a specified time. The ‘crontab’ program is used to cre-
ate user cron jobs. Reference: http://www.oreillynet.com/linux/cmd/a/at.html
http://www.oreillynet.com/linux/cmd/c/crontab.html
Incorrect Answers:
1
2
3
4
5
6
7
8
9
A:The Cron daemon
(crond)
is
the program that runs the cr\
on job at the specified time. It
is
not used to
set
up a cron job.
B:Atrun
is
used to run jobs scheduled by the
‘at’
program\
.
It
is
not used to
set
up a job to run at a specified
time.
D:Atd
is
the
‘at’
deamon. Similar to the cron daemon, it
\
is
the program that runs the jobs scheduled
with
the
‘at’
command.
Part I
2
QUESTION
After creating a backup of the users home directories called backup.cpio
you are asked to restore a file called memo.ben. What command
should you type?
Correct Answer: cpio –iF backup.cpio memo.ben
Explanation: The ‘cpio’ command is used to create backups or re-
store files from a backup. The –i option is to extract something. The
F option is to specify a file. Here we are extracting memo.ben from a
file named backup.cpio. Reference: http://www.oreillynet.com/linux/cmd/c/cpio.htm
QUESTION
You wish to restore the file memo.ben which was backed up in the
tarfile MyBackup.tar. What command should you type?
Correct Answer: tar xf MyBackup.tar memo.ben
Explanation: Tarfiles are created using the ‘tar’ utility. Therefore,
you should use the ‘tar’ utility to extract the files. The x option is
to extract and the f option is to specify a filename to extract from.
Reference: http://www.oreillynet.com/linux/cmd/t/tar.html
QUESTION
When is the most important time to restore a file from your backup?
1
2
3
4
5
On a regular scheduled basis to verify that the data is a\
vailable.
When the system crashes.
When a user inadvertently loses a file.
When your boss asks to see how restoring a file works.
Correct Answer: A

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