It is a UNIX based open-source operating system, managing the hardware and software of computers. There is a variety of distributions or flavors of Linux including commercials like Ubuntu, Fedora, OpenSUSE as well as community-driven like Arch Linux and Debian. But, one thing they have in common is ‘Linux Kernel’. Linux is quite popular among programmers because it is powerful, versatile, and fast, offering the package manager and allowing the programmers to install software without any interruption.

Are you an expert Linux programmer? Now, you can easily grab your dream job. Simply, go through the Linux interview questions and it makes you feel confident.

Introducing Kernel

It is the operating system’s heart. Linux Kernel is considered the low-level system software, providing an interface for the users to interact. The kernel is responsible for managing the system resources like RAM, Processor, Disk, and output devices.

Shell in Linux

Basically, the Linux shell is a user interface. You can consider entering your inputs into the Linux shell. It will execute the commands, communicating with the Linux operating system to do so. You get to see some varieties such as BASH or Bourne Again Shell, KSH or Korn Shell, CSH or C Shell, and TCSH.

Linux file permissions

Three permission types in Linux are:

  • Read

It allows users to read the file, listing the directory

  • Write

Allowing users to write new files within the directory, modifying the file

  • Execute

Users are allowed to access as well as run the file within a directory.

Directory refers to folders in Windows. The chown and chmod are two commands used for controlling access to files in Linux systems. The command chmod stands for ‘change mode’, allowing modifications of folders and files in Linux. And chown stands for ‘change owner’.

Understanding the use of ‘sudo’

Sudo means ‘super user do!’, if a user adds this before a Linux command, it will conduct the command along with raised privileges. It allows you to perform specific administrative tasks like reboot and installation of servers.

Linux editors

For any operating system, a text editor is compulsory for writing code, plain text. You can divide the editors in Linux into two categories as follows:

GUI editors

These editors are user-friendly and graphical such as Sublime and Gedit

Console text editors

These editors are active inside the terminal, but beginners may get confused with them. Example- Vim, Nano, and Vi

Commands used in Linux file system


This built-in command stands for ‘print working directory’, displaying the entire way to the directory you are recently in.


Cd means ‘change directory’, this command allows you to shift to a directory from the current directory you are working in.


This command is designed for listing out different files in the recent folder.


This command is used for removing a directory from your system.


It creates a completely new directory.

What is Command Line Interface?

Command Line Interface or CLI an interface in Linux system based on text, allowing users to interact with the applications and OS. Thanks to CLI, users can manually enter commands and perform tasks. It offers easy and fast working mechanism.

What LILO stands for?

It is the boot loader for Linux system for loading it into the memory to it starts functioning. It is a small program managing a dual boot, residing in Master Boot Record or MBR in short.

Finding help on Linux

To find help on Linux, you need to run the command along with the flags –help or –h. to give an example, to know about K type K –help.

The command ‘man’ is responsible for showing detailed manuals for every command, referred to as ‘man pages’. If you are interested in knowing about Cd command, type man Cd.

Knowing about Grep, Awk, and Sed

Grep stands for Global Regular Expression Print, it helps for searching particular terms in a file.

Awk is a scanning and processing language used to extract data and to report in Excel files.

Sed stands for Stream Editor, performs text transformations on an input stream or a given file.

Achieve the job you deserve

Are you Linux expert? If you have intense knowledge about the Linux operating system and willing to establish a career in this field, you must put sufficient effort to find the best job. Prepare yourself to face all the Linux interview questions, answer them confidently, and secure your dream job.

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