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How to print the last 20 lines of a file to the CLI?

CLI: Command Line Interface(CLI) is a user interface that is used to operate software and operating systems which allows the user to respond to visual prompts by typing commands into...

How to open a file using the “vi” text editor ?

INTRODUCTION: The vi editor (visual editor) is a screen editor which is available on the almost all Unix systems. Once you have learned vi, you will find that it is...
Search Specific String Graphical Illustration Search A Particular String In A File

How to search for a string in a specific file?

Grep Command: The grep command, which means a global regular expression print, it remains amongst the most versatile commands in a Linux terminal environment. String : A string is a contiguous sequence of...
BMP File Format

What is BMP File?

About BMP File: The BMP file is the raster graphics image file format and used to store bitmap digital images. The BMP file format was capable of storing two-dimensional digital...
File/Folder Permission

How to Change the File/Folder Permission using Terminal?

Linux: Linux is a Unix-like, open source and community-developed operating system for computers, servers, mainframes, mobile devices and embedded devices. Every file and directory in Unix/Linux system have three permissions. They are read,...
Pico-command

What command is used to edit the file in SSH?

The  Pico (Pine composer) is a text editor for the Unix and Unix-based computer systems. This has been designed by the Office of the Computing and Communications at the...
VCF File Extension

What is file extension VCF?

What is VCF? VCF Files also called as vCards, the global standard for storing personal or business contacts. The VCF file is used to import and export contacts between the...
Import Vcard from Outlook

How to import Vcard from Outlook?

About Vcard: The VCF file is used to import and export contacts between the two programs or devices and their respective address books. They can send e-mail attachments also. The...
rDNS entry - Resource Record

What is rDNS?

rDNS (reverse DNS): In computer networking, reverse DNS lookup or reverse DNS resolution (rDNS) is associated with an IP address via querying DNS. It is usually “reverse” DNS lookup of...
Check currently logged-in users

How to list currently logged-in users and their location?

A system administrator should know who is on the system at any particular time. We can find the list of users currently logged in the system and their geographical...