Author: Rahul

Shell scripting is a powerful tool that can automate tasks, control system processes, and do complex operations. Learning how to add delays or pauses in your scripts is important. This is useful when you want to space out commands or make sure some processes finish before moving on. Here, we will show you how to add delays in your shell scripts using the ‘sleep’ command. The Basics of Adding Delays The ‘sleep’ command is used in shell scripts to pause the next command for a set amount of time. The basic syntax of the ‘sleep’ command is simple: sleep NUMBER[SUFFIX]…

In a world where digital transactions and communications are a part of everyday life, security becomes a paramount concern. One of the vital aspects of this security paradigm is Transport Layer Security (TLS), a protocol responsible for ensuring a secure communication environment over the internet. But what exactly is TLS, and how does it work? Let’s delve into the ABCs of TLS. What is TLS? Transport Layer Security, often simply referred to as TLS, is a cryptographic protocol designed to provide secure communications over a computer network, most notably the internet. It is the successor to Secure Sockets Layer (SSL),…

Docker is a free tool that helps developers put their apps in containers that can run anywhere. SSH is a way to securely connect to another computer and run commands. This article shows you how to set up an Ubuntu Docker container with SSH access. Prerequisites Before we begin, you need the following software installed: Docker: You can install Docker by following the instructions in the official Docker documentation. SSH client: For Linux and MacOS, the SSH client is usually pre-installed. Windows users can use PuTTY or the built-in SSH client in Windows 10 and newer versions. Step 1: Pull…

The `ls` command is a crucial tool in the repertoire of both novice and advanced Linux users. It’s a simple yet versatile command that provides a list of files and directories in the current directory by default. Beyond its most basic use, the ls command has numerous options that can provide extensive details about these files and directories, including permissions, size, last modification dates, and more. In this article, you will learn about basic uses of the ls command in Linux along with few commonly used command-line options. Basic Usage of ls Command The most straightforward use of the ls…

In the course of your development work, you may often encounter situations where two or more branches in your Git repository need to be merged. This operation, while routine, can sometimes run into complications. One such issue is the error message: error: You have not concluded your merge (MERGE_HEAD exists). This error typically occurs when a merge has been initiated but not completed. In this article, we will walk through the steps to troubleshoot and resolve this error. Understanding the Error When you attempt to merge two branches in Git, the tool creates a temporary .git/MERGE_HEAD file. This file contains…

Environmental variables are essential in developing software. They keep sensitive data, like API keys and database credentials, separate from your code. When developing Node.js applications, a popular approach is to store environment-specific settings in .env files. In this article, we will learn how to read .env files in Node.js, a skill that can dramatically increase your efficiency and productivity as a Node.js developer. What is a .env file? A .env file is a simple configuration file used to store environment variables. It is a plain text file containing key-value pairs, and each line represents an environment variable. An example of…

JavaScript is a very popular programming language used all over the world. One useful feature of JavaScript is that it can check if the Caps Lock key is on or off. This is very important for things like password inputs where the user might not know that their Caps Lock is on. In this article, we will learn how to check if the Caps Lock key is on or off using JavaScript. What you will learn? Understanding the KeyboardEvent object in JavaScript Detecting the status of the Caps Lock key The KeyboardEvent Object To check if the Caps Lock key…

Factorial is a fundamental concept in mathematics with a broad range of applications. From permutations and combinations in combinatorics to Taylor series in calculus, the factorial function plays an essential role. The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. In this article, we will delve into the specifics of calculating factorials using a C programming language, explaining both iterative and recursive approaches. Understanding Factorials The factorial of a number is the product of all positive integers up to that number. For instance, the factorial of…

Mathematics has many interesting numbers with special properties. One of these types is called prime numbers. Prime numbers have fascinated mathematicians for thousands of years. Although their definition is simple, they are very important in many areas, like cryptography and computer science. What is a Prime Number? A prime number is a natural number greater than 1 that cannot be divided exactly by any other numbers except 1 and itself. In simple words, a prime number has only two divisors: 1 and the number itself. Example: The number 2 is a prime number because the only way to express 2…

When working with Linux, especially Fedora, CentOS, or RHEL distributions, the DNF or “Dandified YUM” is an indispensable tool. DNF is the next-generation version of the Yellowdog Updater, Modified (YUM), a package manager for .rpm systems. Often, you may need to download package dependencies without necessarily installing them. This guide provides a detailed step-by-step process for accomplishing this task using DNF. Prerequisites This tutorial assumes that you’re using a Linux distribution that uses DNF as the package manager. If your system uses YUM, it may be possible to perform similar tasks, but the specific steps and commands can vary. Step…