This article provides most
frequently asked interview questions with answers for Linux Technician.
You are
tasked to build a new Linux workstation. User wants to install a word processor
and spreadsheets that offers a similar version for Microsoft Windows system.
Which office suite should you install?
You should use Apache
OpenOffice. Its free and open source project. And works fine on both Window and
Linux systems.
A technician uses the ps
command to see what processes are running. When the current running processes
are shown, he notices a process that he terminated 10 minutes ago by using the
kill command is still running. What command should he use next to terminate
this process?
He should use -9 argument with
kill command that will send a kill signal to the process. This will terminate
the specific process immediately.
A technician quickly
notices a kernel error message on the screen during the boot process.
Unfortunately, the error message disappear so quickly for the technician to
read it all. What log directory can the technician use to examine boot-time
messages?
Linux system keeps almost all
log files under the /var/log directory. Most of the boot messages are kept in
buffer, which can be accessed by using the dmesg command. He can examine the
/var/log/dmesg.log file. For boot time message he can also check the
/var/log/boot.log file.
A technician wants to view
a list of all running processes on the server. How can he do this?
He should use the ps command
with -ef argument. ps -ef command will show a list of all running process.
Where inittab file is
located?
Default location of inittab
file is /etc directory. This file describes which process would be start at
boot time.
A technician want to boot
the system in CLI mode on start up. Which runlevel should he assign and in
which file ?
He could assign runlevel 3 as
the default runlevel in /etc/inittab file.
What program a technician
can use to analyze program's core dump files and to debug the application while
it is actually running?
He can use gdb program to
analyze program's core dump files and also debug the application while it is
actually running.
As a technician you want
to shutdown the Linux system. What command should you use ?
You could use shutdown command.
As a
technician you need to perform a scheduled shutdown that will occur in 10
minutes. What should you use to shut down the server in 10 minutes.?
You can use -h argument with
shutdown command which allows you to specify the time in second. To shutdown
the system in 10 minute you should run shutdown -h 600 command.
What command will halt the
system?
halt will halt the system.
As a technician you need
to restart the Apache Web Server. What command should you use.?
You could use following command
to restart the Apache web server.
#service httpd restart
Which command will restart
the FTP Server?
#service vsftpd restart
Above command will restart the
FTP server.
What line printer control
command is used to control the operation of the line printer system?
lpc command is used with
various argument to control the operations of line printer system.
A technician wants to terminate
an active spooling daemon on the local host immediately and then disables
printing for the specified printers. What command should he use?
He should use lpc command with
abort options. lpc abort lpc abort terminates an active spooling daemon on the
local host immediately and then disables printing for the specified printers,
What print command stops a
spooling daemon after the current job completes and disables printing?
The lpc stop command stops a
spooling daemon after the current job completes and disables printing
What command allows you to
directly see what jobs are currently in a printer queue?
The lpc command allows you to
directly see what jobs are currently in a printer queue
A technician wants to halt
the Linux server. What command should he use ?
He can use init 0 command to
halt the Linux server.
What line printer command
lets you remove print jobs from the printer queue?
The lprm command will let you
remove print jobs from the printer queue.
What is the default text
editor of Linux which include almost every version of Linux?
Default editor of Linux is vi
editor that can used to edit any ASCII text.
What command is used for
combining a large number of files into one single file for archival to tape?
vi is a text editor that can be
used to edit any ASCII text. It is especially useful for editing programs.
Where do
all your configurations for your services, programs, and daemons reside by
default?
By default, all configurations
for your services, programs, and daemons reside in the /etc directory.
What type of backup tape
will only back up files that have changed since the previous backup and clear
the archive bit?
An Incremental backup will
backup only files that have changed since the previous backup and clear the
archive bit.
Which argument is used
with tar command to create a new archive file?
-c argument is used to create
new archive file.
Which argument is used
with tar command to extract the files from archive ?
-x argument is used with tar
command to extract the files form archive.
What is default name of
super or administrator account name in Linux?
Super or administrator account
in Linux is known as root user.
A technician is going to
install Linux on a workstation. The technician wants to customize the
installation. What type of installation will the technician use to customize
the installation?
Only a custom installation can
be used to customize what is installed during an installation. A custom
installation will allow you to choose what packages you want to install and
what packages you don’t want to install.
Where is the password file
for Linux located?
The password file for Linux is
located by default in the /etc/passwd location.
Which program is mostly
used for remote login securely in Linux?
SSH is used for secure login.
SSH is the replacement of old unsecure services like telnet.
What file contains a list
of user names that is not allowed to log in to the FTP server?
The ftpusers file contains a
list of usernames that a Linux administrator has previously set to not allow
specific users to login to the FTP server. ftpusers file is located in
/etc/vsftpd directory.
Which
command can be used to schedule recurring tasks?
Cron command can be used to set
scheduled recurring tasks.
In which directory Linux
store crontab files for particular users?
The /var/spool/cron is the
directory where user’s crontabs are saved with a directory for each user in
which all user’s cron jobs are stored.
What command should you
use to activate a swap partition?
swapon command is used to
activate the swap partition.
A technician is verifying
the network configuration of a Linux server. Which command he should used to
accomplish this?
ifconfig is the proper command
to examine network configuration.
A technician wants to
assign IP addresses to all the systems that will connect to the server
automatically. What type of server he should set up?
He should set up DHCP Server
which assigns IP address to client automatically on start up.
A technician wants to add
a new user to the current domain. What command will the technician use to
accomplish this?
He should use useradd command
followed by the username will create a new user or update default new user
information. You need to specify the password separately with the passwd
command.
What option a technician
can use with usermod command to unlock to user's password?
The -U option is used with
usermod command to unlock the user's password.
What
option of the mkfs command should you use to check the device for bad blocks
before building the file system?
The –c option when used with
the mkfs command will check the device for bad blocks before building the file
system.
What at command argument
will send mail to the user when the job has completed, even if there was no
output?
-m argument with at command
will send mail to the users when the job has completed even if there was no
output.
A user wants to verify the
current active shell. Which command will he use?
He should use the env command
to verify the current active shell
What command can a
technician use to search for a specific file?
He can use either find or
locate command to search for a specific file.
How can you send the
output of a file to another file?
The > option is used to send
the output of a file to another file.
What is the -t option with
fsck command used for?
The –t option used with fsck is
used to specify the type of filesystem to be checked.
Which utility should you
use to display the CPU processes?
top utility lets you see all on
one screen how much memory and CPU usage that you are currently using, and also
the resource usage by each program and process.
What command can you use
to obtain information about your serial port resource usage, such as IRQ and IO
addresses?
setserial is a utility that you
can use to obtain information about serial port resource usage, such as IRQ and
IO addresses.
A technician wants to
delete the a user account. Which command should he use?
The userdel command is used to
delete a user from the system.
Which command is used to
change from one directory to another?
cd command is used to navigate
the Linux hierarchical file system structure, use the cd command to change from
one directory to another.
A user wants to copy a
file from the /tmp directory to the his home directory. Which command would he
use?
He can use cp command to copy
the files from one directory other directory.
What is
the file extension of Red Hat Package manager?
.RPM extension is associated
with the Red Hat Package manager
What command can you use
to mount a CD-ROM drive?
mount command will mount the
CD-ROM.
A technician wants to
monitor connections to a Linux server. Which command should the technician use?
He should use netstat command.
Netstat is a perfect way to see and monitor the both inbound and outbound connections.
This command also be used to view packet statistics so you can see how many
packets have been sent and received.
Which command a user can
use to exit a login shell?
The logout or exit command will
exit him from a login shell.
A technician is having
problems connecting to a mail server. What command can he use to test if the
mail server is on the network?
He can use ping command to test
connectivity between local system and remote server.
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