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Articles on Trending Technologies
Technical articles with clear explanations and examples
Logical Clock in Distributed System
Logical clocks in distributed systems provide a way to order events across multiple machines that do not share synchronized physical clocks. Since each machine may have its own local clock running at different rates, logical clocks assign timestamps to events based on causality rather than actual time, creating a consistent virtual global timepiece across all machines in the system. The Need for Logical Clocks In distributed systems, establishing the order of events is crucial for maintaining consistency. Physical clocks on different machines may drift or run at different speeds, making it impossible to rely on wall-clock time for ...
Read MoreHow to Flush DNS Cache in macOS, Windows, & Linux?
The Domain Name System (DNS) translates numerical IP addresses into readable domain names, making it easier to access websites. When your computer connects to the internet, it stores DNS information in a local cache to speed up future requests. However, this cached information can become outdated or corrupted, requiring you to flush the DNS cache to resolve connectivity issues. What is DNS Cache? When a computer or device connects to the internet, it saves a copy of DNS information in its memory cache called the DNS cache. This cache stores domain names, their corresponding IP addresses, and other ...
Read MoreConky – The Ultimate X Based System Monitor Application
Conky is a highly customizable system monitor application for Linux that displays system information directly on the desktop in a visually appealing way. It is designed to be lightweight, runs in the background with minimal performance impact, and offers extensive customization options for creating personalized desktop monitoring displays. What is Conky? Conky is an X Window System monitor application for Linux that displays real-time system information such as CPU usage, memory consumption, network activity, disk usage, and more. Written in C and utilizing the X11 library for graphics rendering, Conky is designed to be resource-efficient while providing comprehensive ...
Read MoreHow to Disable SSH Root Login in Linux?
SSH (Secure Shell) is a critical protocol used to remotely access and manage Linux servers securely. While SSH provides encrypted communication between clients and servers, allowing root login via SSH creates significant security vulnerabilities. The root user has complete system control, making unauthorized root access extremely dangerous for system integrity. This guide demonstrates how to disable SSH root login in Linux systems, reducing attack vectors and implementing security best practices for server administration. Security Risks of SSH Root Login Enabling root login via SSH exposes your system to several critical security threats: Brute Force Attacks ...
Read MoreHow to create a CPU spike with bash command on Linux?
If you have been programming, then you might have observed certain cases and scenarios where the program gets stuck or the process is running in an infinite loop which in turn puts pressure on the core of that thread which is handling that process. There are many such cases where this is quite a possibility. We usually make use of different techniques to avoid such cases, like handling them in code logic itself or using third party tools to deal with them. Linux also provides us with a command that we can use to keep track of the different ...
Read MoreWhat are hardware and software resources managed by the OS?
An operating system (OS) serves as the primary manager of all computer resources, acting as an interface between hardware components and software applications. The OS coordinates and allocates resources to ensure efficient system operation and prevent conflicts between competing processes. Types of Resources Managed by OS The operating system manages two main categories of resources − Hardware Resources Processor(s) − CPU scheduling, multi-core management, and process allocation Memory (RAM) − Physical and virtual memory allocation, paging, and segmentation Storage Devices − Hard disks, SSDs, and removable media like USB drives and DVDs Input/Output Devices − ...
Read MoreMac OS X Structure
Mac OS X is a graphical operating system developed by Apple Inc. The tenth version of Mac OS, launched in 2001, introduced a revolutionary layered architecture that combines Unix stability with an elegant user interface. The Mac OS X structure consists of multiple layers working together to provide a robust computing environment. The foundation is Darwin, the Unix core of the system. Above it lies the graphics system containing Quartz, OpenGL, and QuickTime. The application layer includes four components: Classic, Carbon, Cocoa, and Java. The top layer is Aqua, the distinctive user interface. Mac ...
Read MoreHow to Show the wget Progress Bar Only in Linux?
Remote management of UNIX/Linux/BSD servers via SSH session is a common practice. For installation, you might need to download software or other files. While Linux has several graphical download managers, the wget command-line tool is preferred for non-interactive downloads. The wget command supports various Internet protocols including HTTP, HTTPS, and FTP. Basic Wget Usage The simplest use of wget is downloading a single file to your current directory. Type wget followed by the file URL − $ wget https://www.tutorialspoint.com/index.htm --2022-12-26 10:18:13-- https://www.tutorialspoint.com/index.htm Resolving www.tutorialspoint.com (www.tutorialspoint.com)... 192.229.221.69 Connecting to www.tutorialspoint.com (www.tutorialspoint.com)|192.229.221.69|:443... connected. HTTP ...
Read MoreBash Export Variable
Bash is one of the most commonly used shells in Unix-based operating systems. It provides a command-line interface that allows users to interact with the system and execute various commands. One of Bash's key features is the ability to export variables, making them available to child processes as environment variables. In this article, we will explore the fundamentals of exporting variables in Bash, including syntax, usage patterns, and practical examples for system administration and scripting tasks. What is a Bash Export Variable? A Bash export variable is a variable that is made available to all child processes ...
Read MoreHow to Force cp Command to Overwrite without Confirmation?
In Unix-like operating systems, the cp command is essential for file management, allowing you to copy files and directories from one location to another. While cp normally prompts for confirmation before overwriting existing files, this can become tedious when copying multiple files or running automated scripts. The -f flag (force) tells cp to overwrite existing files without asking for confirmation, making file operations faster and more suitable for automation. Understanding the -f Flag The -f flag stands for "force" and instructs the cp command to overwrite any existing destination files without prompting. This is particularly useful in ...
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