Linux Interview Questions and Answers

Last updated on Mar 08, 2022
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Linux Interview Questions

A genuinely free and open source operating system, Linux is one of the most liked operating systems. It was designed keeping in mind the Unix compatibility. Read our detailed Linux interview questions to know more about the features and commands of Linux. Usually, it is called as the clone of Unix. Linux was developed by Linus Torvalds. While working on the Unix OS, he felt the need to improve Unix, but the designers of Unix rejected his suggestions. Hence, he founded the Linux in 1991 as a kernel first, which was later launched as a full-fledged OS.

Most Frequently Asked Linux Interview Questions

Here in this article, we will be listing frequently asked Linux Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. How to stop a process running in Linux?
You can kill the process using –
  • kill PID – It is used to kill a particular process.
  • killall – It is also used to kill all the running processes.
Q2. What is Linux and why it is used?

An open-source operating system, Linux is currently one of the best OSs. It can be considered as software that sits underneath and communicates with the other software on a computer and passes on requests from those software programs to the hardware.

Linux is used because it is –

  • Highly stable and secure
  • Can be maintained easily
  • Can run on any hardware system
  • Open source and free to use
  • Extensive documentation and support
Q3. What is the difference between Linux and Redhat?
1. Specific distribution backed by the company RedHat General term for the Linux OS. Can refer to any distribution.
2. RedHat is a specific OS built on Linux Kernel. Linux is essentially a kernel.
3. To receive support and updates, one needs to have a proper agreement with the company. Follows the Open source model
Q4. What does Swap mean in Linux?

If a Linux server runs out of memory, the kernel moves some inactive processes from Linux server to a disk that acts as the virtual memory. This disk space is called a Swap.

Q5. What are the essential features of the Linux operating system?
  • Multi-tasking is possible without slowing down CPU.
  • Offers high security compared to other OSs like Windows, iOS, etc.
  • Can be converted from the command line to GUI by installing required packages.
  • Open source code with great community and support.
  • Can run on different hardware types.
  • Hierarchical file system.

Read details about the security features of Linux in the next question of our Linux Interview questions list.

Q6. How is Linux more secure compared to other operating systems?
There are multiple reasons for this –
  • Linux gives very low access to its users. If there is a virus attack, only a few files will be corrupted not the whole system.
  • It is less vulnerable because a user needs complete execution rights for opening even an email attachment.
  • The working environment in Linux is segmented in different environments like Ubuntu, Arch, Linux Mint, etc. This division gives much protection from the virus.
  • Linux uses Iptables which requires advanced privileges to function.
Q7. What is the structure of Linux?

Linux has a layered structure –

Standard Utility library


The standard library of procedures


Device drivers


  • Hardware - the CPU, RAM, mouse, the keyboard is the hardware
  • Kernel - contains device drivers and handles resource allocation, acts as an interface between the hardware and the operating system.
  • The standard library of procedures – termed as libc, allows the user to communicate with the kernel.
  • User applications and standard utilities – the commands for various tasks like computing, modifying files or taking backups, etc.
Q8. What are the functions of a Linux operating system?
Q9. What are the core components of Linux?

The core components of Linux are boot loader, kernel, shell, Daemons, window manager and X window server.

Q10. What is the virtual desktop in Linux?

Virtual desktop provides secure access to Linux VDI even from non-Linux devices like Windows. This helps admins manage Windows and Linux applications using one console.

There are 3 main components in Linux
  • Kernel, which communicates with the users and the underlying hardware;
  • System library, which is a collection of functions and programs that contain almost all the functionalities of an operating system. Users can access the kernel’s features using these library functions;
  • System utility, which is a set of programs that do individual, specialized tasks

Check out all the Linux interview questions to understand how Linux is a more improved version of Unix.

Advantages of Linux
  • Linux is open source. Hence there are several distributions available to the end user. Example – Ubuntu, Mint.
  • By making the code available to everyone, security issues are caught by experts before the versions are released to the public, hence offering higher security.
  • Linux can be installed on any hardware without any hassle.
  • Highly customizable and flexible because of the availability of source code.
  • Provides good networking support using many commands. (Read more about this in our set of Linux interview questions)
  • Has good support and documentation.
Latest version

The latest version of Linux is Debian 9.3 released on December 9, 2017.

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