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Linux Interview Questions and Answers
You need to see the last fifteen lines of the
files dog, cat and horse. What command should you use?
tail -15 dog cat horse
The tail utility displays the end of a file. The -15
tells tail to display the last fifteen lines of each
specified file.
Who owns the data dictionary?
The SYS user owns the data dictionary. The SYS and
SYSTEM users are created when the database is created.
You routinely compress old log
files. You now need to examine a log from two months
ago. In order to view its contents without first having
to decompress it, use the _________
utility.
zcat
The zcat utility allows you to examine the contents of a
compressed file much the same way that cat displays a
file.
You suspect that you have two commands with the same
name as the command is not producing the expected
results. What command can you use to determine the
location of the command being run?
which
The which command searches your path until it finds a
command that matches the command you are looking for and
displays its full path.
You locate a command in the /bin directory but do not
know what it does. What command can you use to determine
its purpose.
whatis
The whatis command displays a summary line from the man
page for the specified command.
You wish to create a link to the /data directory in
bob's home directory so you issue the command ln /data
/home/bob/datalink but the command fails. What option
should you use in this command line to be successful.
Use the -F option
In order to create a link to a directory you must use
the -F option.
When you issue the command ls -l, the first character of
the resulting display represents the file's ___________.
type
The first character of the permission block designates
the type of file that is being displayed.
What utility can you use to show a dynamic listing of
running processes? __________
top
The top utility shows a listing of all running processes
that is dynamically updated.
Where is standard output usually directed?
to the screen or display
By default, your shell directs standard output to your
screen or display.
You wish to restore the file memo.ben which was backed
up in the tarfile MyBackup.tar. What command should you
type?
tar xf MyBackup.tar memo.ben
This command uses the x switch to extract a file. Here
the file memo.ben will be restored from the tarfile
MyBackup.tar.
You need to view the contents of the tarfile called
MyBackup.tar. What command would you use?
tar tf MyBackup.tar
The t switch tells tar to display the contents and the f
modifier specifies which file to examine.
You want to create a compressed backup of the users'
home directories. What utility should you use?
tar
You can use the z modifier with tar to compress your
archive at the same time as creating it.
What daemon is responsible for tracking events on your
system?
syslogd
The syslogd daemon is responsible for tracking system
information and saving it to specified log files.
You have a file called phonenos that is almost 4,000
lines long. What text filter can you use to split it
into four pieces each 1,000 lines long?
split
The split text filter will divide files into equally
sized pieces. The default length of each piece is 1,000
lines.
You would like to temporarily change your command line
editor to be vi. What command should you type to change
it?
set -o vi
The set command is used to assign environment variables.
In this case, you are instructing your shell to assign
vi as your command line editor. However, once you log
off and log back in you will return to the previously
defined command line editor.
What account is created when you install Linux?
root
Whenever you install Linux, only one user account is
created. This is the superuser account also known as
root.
What command should you use to check the number of files
and disk space used and each user's defined quotas?
repquota
The repquota command is used to get a report on the
status of the quotas you have set including the amount
of allocated space and amount of used space.
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