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DNF (Dandified Yum) is a modern package manager for RPM-based Linux distributions and serves as the successor to Yum. Introduced in Fedora 18, DNF offers significant improvements including faster performance, better memory usage, and a cleaner codebase. This article explores essential DNF commands for RPM package management in Linux distributions like Fedora, CentOS 8+, and Red Hat Enterprise Linux 8+. Basic DNF Commands DNF provides essential commands for everyday package management tasks. These commands automatically handle dependency resolution, making package installation and removal much simpler than using RPM directly. Installing Packages To install a package and ... Read More
Virtualization is the process of creating virtual versions of operating systems, servers, and network resources. It allows applications that lack compatibility with a system to run on the same computer by breaking the system into multiple virtual environments. In virtualization, the physical system is divided into multiple parts called virtual machines. The original system is known as the Host system with its Host OS, while the virtual machines are called Guest systems running their respective Guest OS. Virtualization Architecture Physical Hardware (CPU, Memory, ... Read More
In computer systems, swapping and context switching are two fundamental mechanisms that serve different purposes in process management. While both contribute to system efficiency and multitasking capabilities, they operate at different levels and address distinct system requirements. What is Swapping? Swapping is a memory management technique where an entire process or its segments are moved between main memory (RAM) and secondary storage (disk). This allows the system to accommodate more processes than physical memory can handle by temporarily storing inactive processes on disk. Swapping Process Main Memory ... Read More
The unzip command is a Linux utility used to extract compressed files from ZIP archives. When working with multiple ZIP files in a directory, you can extract them all at once using wildcard patterns and command-line options. Installing Unzip By default, the unzip utility is not present on most Linux distributions. You can install it using the package manager for your distribution. For Ubuntu and Debian sudo apt install unzip For CentOS and Fedora sudo yum install unzip Basic Syntax unzip file.zip In the above ... Read More
The UNIX operating system is built with a layered architecture consisting of four main components that work together to provide a complete computing environment. Understanding these components and the shell interface is essential for working with UNIX systems. Components of UNIX A UNIX system consists of four fundamental components − UNIX System Components USER APPLICATION PROGRAMS OPERATING SYSTEM (UNIX) ... Read More
Single-threaded processes execute instructions sequentially, processing one command at a time in a linear fashion. In contrast, multi-threaded processes allow multiple parts of a program to execute concurrently, creating lightweight execution units called threads within the same process space. Types of Threading Implementation Multi-threaded processes can be implemented at two levels − user-level threads managed by application libraries, or kernel-level threads managed directly by the operating system. Multi-threaded Process Implementation User-Level Threads User Thread ... Read More
This article will show you how to configure a DNS caching server (also called a forwarding server) in a local environment using BIND. DNS (Domain Name System) servers are critical infrastructure components for proper website and server operation. While many users rely on DNS servers provided by hosting companies or domain controllers, setting up a local caching DNS server can improve performance and reduce external dependencies. What is a Caching DNS Server A caching DNS server stores DNS query results locally to speed up future requests. These servers are called resolvers because they handle recursive queries and perform ... Read More
Debian is one of the most popular Linux distributions among users, and it uses .deb package format to install software packages. These packages contain all necessary files and instructions for installing software on your system. While there are several ways to install Debian packages, using the command line is the most efficient way. In this article, we will discuss three command-line tools that can be used to install local Debian packages. APT (Advanced Package Tool) APT is the default package manager in Debian, and it can be used to install packages from repositories or local packages. To install ... Read More
If you're new to the command line interface, you may have come across the terms .bashrc and .bash_profile. These are important configuration files found in your home directory that customize your shell environment. However, many users are confused about the differences between these two files. In this article, we'll explore the key differences between .bashrc and .bash_profile and explain how they work. What is .bashrc? The .bashrc file is a configuration script for the Bash shell that executes every time you open a new non-login terminal session. This includes opening new terminal windows or tabs in a graphical ... Read More
Linux is a powerful and flexible operating system that is widely used in server environments. In these environments, it is common for multiple users to work on the same system and even belong to the same user groups. However, there may come a time when you need to remove a user from a group, either because they no longer require access or due to security reasons. In this article, we'll look at how to remove a user from a group in Linux. What are User Groups in Linux? User groups are an essential feature of Linux operating systems. ... Read More