All You Need to Know About Linux Fundamentals


All You Need to Know About Linux Fundamentals

Do you know what Linux in the world of IT is referred to as? It’s referred to as air, the most essential. Because you can’t see it, you may feel that it doesn’t exist, but it’s that important. The amount of technology that runs and relies on Linux is massive, in fact, it’s almost everything. You see, that’s how the air reference fits here. Be it your android smartphone, the apps that drive your smartphone or controlling air traffic, there’s a huge reliance on Linux, even the Large Hadron Collider.

About Linux

Linux, the operating system based on UNIX, manages a system’s software and hardware. When you want to perform a task, you will now just simply have to put in the source code and that too for free because some genius invented the software already and made it easy for a lot of people out there. Similarly, you can also debug the source code by adding your own features.

Linux has various distributions, for example, Fedora and OpenSUSE. These are commercial, while Arch Linux and Debian are entirely community driven. All these are composed of the Linux Kernel. The reason Linux appears so appealing to the programmers is because of its diversity, speed, package management, and power. All this lets the system to be installed seamlessly.


The Kernel to Linux is what the heart is to the body. Kernel, in Linux, is low-level software of the system. The interface at user-level interaction is provided by Kernel. The system resources which include the RAM, Disk, output devices, and Processor are managed by the Kernel.

The Shell in Linux

It is a user interface that performs the task to enter input commands into the shell. The shell would then execute the command and communicate to Linux OS in doing so. The varieties include CSH (C Shell), BASH (Bourne Again Shell), KSH (Korn Shell) and TCSH.


The short form for Bourne Again Shell, this is a command language and also has a command syntax of its own.

File Permissions in Linux

There are three types of file permissions in the Linux OS:

  • Read: here the user can read the list directory and the file.
  • Write: user can modify files here and also write new ones.
  • Execute: running of the file by the user in the directory.

The directory carries a resemblance to that of a Windows folder. The commands Chmod and Chown control the access to the files present in UNIX and Linux systems. Here Chmod represents “change mode.” Its purpose is to allow permission to change the folders and files in Linux. Chown represents the command “change owner.”


Representing the term “superuser do!” When a user adds the term sudo before any command for Linux, the command will perform the task with elevated privileges. Now users can perform certain tasks of the admin, for example, the installation of servers or the reboot.

Editors in Linux

Users just cannot do without an editor in Linux. A must-have application for an operating system. It has two categories:

  • GUI: graphical and friendly for the user for example Gedit and Sublime.
  • Console Text Editors: though difficult for the beginners these editors are present and work inside the terminal

The Cron

This is a job scheduler that works on the concept of time calculation. Cron will line up jobs which are basically the commands given to the software. These jobs will be run periodically by the Cron, the timing, date, and intervals will be fixed, and the jobs will be performed as per the setting of these three elements just mentioned.

So, if you do not get time to download that movie you wanted to watch over the weekend, you could ask cron to perform that task for you, and it will do so. Just have to write, download the “movie name,” and Cron will do it for you.


Stands for Logical Volume Management, LVM as the name suggests volume management performs the task of a technology that manages storage in a device. It enables users to collect and abstract an underline for components storage device examples for these are eternal drives and hard disks. This helps provide easy administration and flexibility.

The Grep, Awk, And Sed

These three are the ed, edd, and eddy of Linux. Three of the most required and integral command tools.


Represents, Global Regular Expression Print, this command is to search for specific words in a file such as, if you want to search the term, output in a file.


This is a scanning pattern for texts and processing language. The purpose it is most utilized for is the extraction of data and reporting from Excel files. For example, if you wish to have certain columns of an excel sheet printed you can do so without having to print an entire sheet.


This is a Stream Editor. A Stream editor will transform text for you on a file or on an input stream. So, when you use your friend’s assignment for Science class and replace his name with yours at all places, you’re using Sed!


Through the fundamentals mentioned above, we can analyze the crucial role that Linux plays in our lives. The professional world of It cannot function without Linux as the reliance is too high. The integration of Linux in organizational systems and programs spell out the need for individuals to opt for Linux certification as IT Ops training. There are quite many Online IT training forums that can help individuals in getting equipped with Linux based skills. Contact our experts today for IT Ops Training and become an expert who has an in-depth knowledge of the Linux system.

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