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Linux Interview Questions and Answers
What key combination can you press to suspend a
running job and place it in the background?
ctrl-z
Using ctrl-z will suspend a job and put it in the
background.
The easiest, most basic form of backing up a file is to
_____ it to another location.
copy
The easiest most basic form of backing up a file is to
make a copy of that file to another location such as a
floppy disk.
What type of server is used to remotely assign IP
addresses to machines during the installation process?
A) SMB
B) NFS
C) DHCP
D) FT
E) HTTP
C - You can use a DHCP server to assign IP addresses to
individual machines during the installation process.
Answers a, b, d, and e list legitimate Linux servers,
but these servers do not provide IP addresses. The SMB,
or Samba, tool is used for file and print sharing across
multi-OS networks. An NFS server is for file sharing
across Linux net-works. FTP is a file storage server
that allows people to browse and retrieve information by
logging in to it, and HTTP is for the Web.
Which password package should you install to ensure that
the central password file couldn't be stolen easily?
A) PAM
B) tcp_wrappers
C) shadow
D) securepass
E) ssh
C - The shadow password package moves the central
password file to a more secure location. Answers a, b,
and e all point to valid packages, but none of these
places the password file in a more secure location.
Answer d points to an invalid package.
When using useradd to create a new user account, which
of the following tasks is not done automatically.
Choose one:
a. Assign a UID.
b. Assign a default shell.
c. Create the user's home directory.
d. Define the user's home directory.
c
The useradd command will use the system default for the
user's home directory. The home directory is not
created, however, unless you use the -m option.
You want to enter a series of commands from the
command-line. What would be the quickest way to do this?
Choose One
a. Press enter after entering each command and its
arguments
b. Put them in a script and execute the script
c. Separate each command with a semi-colon (;) and press
enter after the last command
d. Separate each command with a / and press enter after
the last command
c
The semi-colon may be used to tell the shell that you
are entering multiple commands that should be executed
serially. If these were commands that you would
frequently want to run, then a script might be more
efficient. However, to run these commands only once,
enter the commands directly at the command line.
You attempt to use shadow passwords but are
unsuccessful. What characteristic of the /etc/passwd
file may cause this?
Choose one:
a. The login command is missing.
b. The username is too long.
c. The password field is blank.
d. The password field is prefaced by an asterisk.
c
The password field must not be blank before converting
to shadow passwords.
When you install a new application, documentation on
that application is also usually installed. Where would
you look for the documentation after installing an
application called MyApp?
Choose one:
a. /usr/MyApp
b. /lib/doc/MyApp
c. /usr/doc/MyApp
d. In the same directory where the application is
installed.
c
The default location for application documentation is in
a directory named for the application in the /usr/doc
directory.
What file would you edit in your home directory to
change which window manager you want to use?
A) Xinit
B) .xinitrc
C) XF86Setup
D) xstart
E) xf86init
Answer: B - The ~/.xinitrc file allows you to set which
window man-ager you want to use when logging in to X
from that account.
Answers a, d, and e are all invalid files. Answer c is
the main X server configuration file.
What command allows you to set a processor-intensive job
to use less CPU time?
A) ps
B) nice
C) chps
D) less
E) more
Answer: B - The nice command is used to change a job's
priority level, so that it runs slower or faster.
Answers a, d, and e are valid commands but are not used
to change process information. Answer c is an invalid
command.
While logged on as a regular user, your boss calls up
and wants you to create a new user account immediately.
How can you do this without first having to close your
work, log off and logon as root?
Choose one:
a. Issue the command rootlog.
b. Issue the command su and type exit when finished.
c. Issue the command su and type logoff when finished.
d. Issue the command logon root and type exit when
finished.
Answer: b
You can use the su command to imitate any user including
root. You will be prompted for the password for the root
account. Once you have provided it you are logged in as
root and can do any administrative duties.
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