# Linux Interview Questions and Answers

- Link: https://kilimanjaroyetu.com/2026/05/20/1000-linux-interview-questions-and-answers/
- Published: 2026-05-20T14:32:16+00:00
- Author: 

**Source:** Sanfoundry

**Question set size:** 44 items

Linux MCQ (Multiple Choice Questions)

Here are 1000 Linux MCQs (Chapterwise)

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## Interview Questions and Answers

### Question 1

What is Linux primarily known as?

 * a) A web server
 * b) An operating system
 * c) A programming language
 * d) A hardware platform

**Answer:** b

**Explanation:** Linux is primarily known as an operating system, specifically a
family of open-source Unix-like operating systems based on the Linux kernel.

### Question 2

Who is the creator of the Linux kernel?

 * a) Linus Torvalds
 * b) Richard Stallman
 * c) Bill Gates
 * d) Steve Jobs

**Answer:** a

**Explanation:** Linus Torvalds is the creator of the Linux kernel, which he first
released in 1991.

### Question 3

Which of the following statements is true about Linux?

 * a) It is a proprietary operating system
 * b) It is only used on servers
 * c) It is an open-source operating system
 * d) It does not support multitasking

**Answer:** c

**Explanation:** Linux is an open-source operating system, meaning its source code
is available for anyone to view, modify, and distribute.

### Question 4

Which of the following is a popular Linux distribution?

 * a) Windows
 * b) Ubuntu
 * c) MacOS
 * d) Android

**Answer:** b

**Explanation:** Ubuntu is a popular distribution of Linux, known for its user-friendly
interface and widespread use in both desktop and server environments.

### Question 5

What is the significance of the Linux kernel?

 * a) It provides a graphical user interface
 * b) It manages system resources and hardware communication
 * c) It stores user data
 * d) It compiles software programs

**Answer:** b

**Explanation:** The Linux kernel is the core component of the operating system 
that manages system resources, hardware communication, and system calls from user
applications.

### Question 6

What command is used to display the version of the Linux kernel running on your 
system?

 * a) version
 * b) uname -r
 * c) kernel
 * d) sysinfo

**Answer:** b

**Explanation:** The `uname -r` command displays the version of the Linux kernel
currently running on the system.

### Question 7

Which command is used to update the package index in Debian-based systems?

 * a) apt-get update
 * b) yum update
 * c) pkg update
 * d) updatepkg

**Answer:** a

**Explanation:** The `apt-get update` command is used to update the package index
on Debian-based systems, such as Ubuntu.

### Question 8

In Linux, what is the purpose of the ‘root’ user?

 * a) A standard user with limited permissions
 * b) The system administrator with full privileges
 * c) A guest user
 * d) A service account

**Answer:** b

**Explanation:** The ‘root’ user is the system administrator in Linux, having full
access and control over the system.

### Question 9

What does the ‘ls -a’ command do?

 * a) Lists all files except hidden ones
 * b) Lists all files including hidden ones
 * c) Lists only directories
 * d) Lists files in a detailed format

**Answer:** b

**Explanation:** The `ls -a` command lists all files and directories in the current
directory, including hidden ones (those starting with a dot).

### Question 10

Which of the following commands is used to change the current directory?

 * a) cd
 * b) change
 * c) goto
 * d) setdir

**Answer:** a

**Explanation:** The `cd` (change directory) command is used to change the current
working directory in Linux.

### Question 11

Which command is used to list all files and directories in a Linux system?

 * a) ls
 * b) dir
 * c) list
 * d) show

**Answer:** a

**Explanation:** The `ls` command is used to list files and directories in the current
directory in Linux.

### Question 12

Which command is used to change the ownership of a file in Linux?

 * a) chown
 * b) chmod
 * c) chgrp
 * d) mv

**Answer:** a

**Explanation:** The `chown` command is used to change the ownership of files and
directories in Linux.

### Question 13

Which file contains the list of users in a Linux system?

 * a) /etc/users
 * b) /etc/passwd
 * c) /etc/groups
 * d) /etc/userlist

**Answer:** b

**Explanation:** The `/etc/passwd` file contains user account information, including
usernames and user IDs.

### Question 14

Which command is used to display the current working directory?

 * a) pwd
 * b) current
 * c) dir
 * d) ls

**Answer:** a

**Explanation:** The `pwd` (print working directory) command displays the full path
of the current directory.

### Question 15

Which command is used to copy files in Linux?

 * a) copy
 * b) cp
 * c) mv
 * d) xcopy

**Answer:** b

**Explanation:** The `cp` command is used to copy files and directories in Linux.

### Question 16

Which of the following commands will display the contents of a file?

 * a) cat
 * b) view
 * c) show
 * d) display

**Answer:** a

**Explanation:** The `cat` command is used to display the contents of a file in 
the terminal.

### Question 17

Which command is used to search for a specific text string in a file?

 * a) grep
 * b) find
 * c) search
 * d) locate

**Answer:** a

**Explanation:** The `grep` command is used to search for specific text patterns
within files.

### Question 18

Which command will change the current directory to the home directory?

 * a) cd ~
 * b) cd /home
 * c) cd .
 * d) cd ..

**Answer:** a

**Explanation:** The command `cd ~` changes the current directory to the user’s 
home directory.

### Question 19

What does the ‘chmod’ command do?

 * a) Change file ownership
 * b) Change file permissions
 * c) Change file name
 * d) Change file location

**Answer:** b

**Explanation:** The `chmod` command is used to change the permissions of a file
or directory in Linux.

### Question 20

Which command is used to create a new directory?

 * a) newdir
 * b) mkdir
 * c) createdir
 * d) dircreate

**Answer:** b

**Explanation:** The `mkdir` command is used to create new directories in the file
system.

### Question 21

Which command can be used to display the last lines of a file?

 * a) tail
 * b) head
 * c) end
 * d) last

**Answer:** a

**Explanation:** The `tail` command displays the last few lines of a file in the
terminal.

### Question 22

Which command is used to compress files in Linux?

 * a) zip
 * b) gzip
 * c) compress
 * d) tar

**Answer:** b

**Explanation:** The `gzip` command is used to compress files in Linux, producing
a .gz file.

### Question 23

Which command displays the manual for another command?

 * a) help
 * b) man
 * c) guide
 * d) info

**Answer:** b

**Explanation:** The `man` command is used to display the manual pages for other
commands in Linux.

### Question 24

Which command is used to install a package in Debian-based distributions?

 * a) install
 * b) apt-get
 * c) yum
 * d) pkg

**Answer:** b

**Explanation:** The `apt-get` command is used to install and manage packages in
Debian-based Linux distributions.

### Question 25

What does the ‘df’ command do?

 * a) Display free disk space
 * b) Display file permissions
 * c) Display system processes
 * d) Display current users

**Answer:** a

**Explanation:** The `df` command displays information about disk space usage on
mounted filesystems.

### Question 26

Which command is used to remove files in Linux?

 * a) delete
 * b) rm
 * c) rmdir
 * d) erase

**Answer:** b

**Explanation:** The `rm` command is used to remove files and directories in Linux.

### Question 27

Which command shows the current processes running in the system?

 * a) list
 * b) ps
 * c) top
 * d) run

**Answer:** b

**Explanation:** The `ps` command displays information about currently running processes
on the system.

### Question 28

Which file is responsible for the boot loader configuration in Linux?

 * a) /etc/boot.conf
 * b) /boot/grub/grub.cfg
 * c) /boot/loader.conf
 * d) /etc/grub.cfg

**Answer:** b

**Explanation:** The `/boot/grub/grub.cfg` file is the configuration file for the
GRUB boot loader.

### Question 29

Which command can be used to monitor real-time system performance?

 * a) monitor
 * b) top
 * c) perf
 * d) stat

**Answer:** b

**Explanation:** The `top` command provides a dynamic view of system processes and
their resource usage in real time.

### Question 30

Which command can be used to view the contents of a directory in a detailed format?

 * a) ls -l
 * b) dir -l
 * c) list -a
 * d) ls -a

**Answer:** a

**Explanation:** The `ls -l` command displays files and directories in a detailed(
long) format, including permissions, owner, size, and modification date.

### Question 31

Which of the following is a Linux distribution?

 * a) Ubuntu
 * b) Windows
 * c) MacOS
 * d) Solaris

**Answer:** a

**Explanation:** Ubuntu is a popular distribution (distro) of Linux, while Windows
and MacOS are not Linux-based operating systems.

### Question 32

What is the default shell for most Linux distributions?

 * a) tcsh
 * b) bash
 * c) sh
 * d) zsh

**Answer:** b

**Explanation:** The default shell for most Linux distributions is `bash` (Bourne
Again SHell).

### Question 33

Which command is used to check network connectivity in Linux?

 * a) netstat
 * b) ping
 * c) trace
 * d) route

**Answer:** b

**Explanation:** The `ping` command is used to check network connectivity to a specified
host by sending ICMP Echo Request packets.

### Question 34

What is the purpose of the ‘sudo’ command?

 * a) To switch users
 * b) To execute a command as a superuser
 * c) To shut down the system
 * d) To display disk usage

**Answer:** b

**Explanation:** The `sudo` command allows a permitted user to execute a command
as the superuser or another user, as specified by the security policy.

### Question 35

Which command is used to view the contents of a compressed file?

 * a) unzip
 * b) gunzip
 * c) extract
 * d) untar

**Answer:** b

**Explanation:** The `gunzip` command is used to decompress files that have been
compressed using `gzip`.

### Question 36

Which file contains system-wide environment variables?

 * a) /etc/environment
 * b) /etc/profile
 * c) /etc/bashrc
 * d) All of the above

**Answer:** d

**Explanation:** All of these files can contain system-wide environment variables
in Linux, depending on the specific settings and user sessions.

### Question 37

What is the purpose of the ‘kill’ command?

 * a) To terminate processes
 * b) To restart services
 * c) To delete files
 * d) To change user permissions

**Answer:** a

**Explanation:** The `kill` command is used to send signals to processes, typically
to terminate them gracefully or forcefully.

### Question 38

Which command is used to display disk usage of files and directories?

 * a) du
 * b) df
 * c) space
 * d) usage

**Answer:** a

**Explanation:** The `du` (disk usage) command is used to estimate and report the
disk space used by files and directories.

### Question 39

In Linux, what is the purpose of the ‘etc’ directory?

 * a) Contains user home directories
 * b) Contains system configuration files
 * c) Contains executable programs
 * d) Contains temporary files

**Answer:** b

**Explanation:** The `/etc` directory contains system configuration files for various
applications and services in Linux.

### Question 40

Which command would you use to change to the root user?

 * a) su
 * b) root
 * c) admin
 * d) sudo

**Answer:** a

**Explanation:** The `su` command is used to switch to another user account, including
the root user, if the correct password is provided.

### Question 41

What command is used to manage user accounts in Linux?

 * a) useradd
 * b) adduser
 * c) usermod
 * d) All of the above

**Answer:** d

**Explanation:** All these commands (`useradd`, `adduser`, and `usermod`) are used
to manage user accounts in Linux, each serving different functions.

### Question 42

Which command is used to monitor system performance and resource usage?

 * a) vmstat
 * b) top
 * c) htop
 * d) All of the mentioned

**Answer:** d

**Explanation:** `vmstat`, `top`, and `htop` are all commands used to monitor system
performance and resource usage in Linux.

### Question 43

Which command is used to schedule tasks in Linux?

 * a) at
 * b) cron
 * c) schedule
 * d) at and cron

**Answer:** d

**Explanation:** Both the `at` command (for one-time scheduled tasks) and `cron`(
for recurring tasks) are used to schedule tasks in Linux.

### Question 44

Which directory contains log files for system events in Linux?

 * a) /var/log
 * b) /etc/log
 * c) /usr/log
 * d) /tmp/log

**Answer:** a

**Explanation:** The `/var/log` directory contains log files for various system 
events, applications, and services in Linux. Chapterwise Multiple Choice Questions
on Linux Our 1000+ Linux MCQs focuses on both Linux Administration & Linux Systems
Programming areas.

**Original page:** https://www.sanfoundry.com/technical-interview-questions/