Author: Rahul

In the world of Debian-based Linux distributions, the Advanced Package Tool (APT) is the go-to package management system. It automates the retrieval, configuration, and installation of software packages on Linux systems. However, there may be times when you need to download all package dependencies without actually installing them. This could be the case when setting up an offline server or simply trying to understand the dependencies of a certain package. In this guide, we’ll explore the necessary steps to do exactly that. Understanding APT and Dependencies Before we delve into the process, it’s crucial to understand what APT is and…

In Node.js, managing application configurations across different environments is a fundamental aspect of professional development practices. It’s essential to have different configurations for development, testing, and production environments to keep your application adaptable and secure. A common approach to handle this challenge is using multiple `.env` files. In this comprehensive guide, we will demonstrate the power of using multiple `.env` files for different environments in Node.js, providing practical examples along the way. Understanding the Need for Multiple .env Files When working on any significant Node.js application, it’s highly likely that you’ll have to work across several environments. You may be…

Secure Shell (SSH) is a secure protocol used in networking to connect to and communicate with remote servers. It uses a pair of cryptographic keys, namely a private key and a public key, which form the basis for the identity of a client or a server. However, you may sometimes encounter the following error while working with SSH: “Load key ‘~/.ssh/id_rsa.pub’: invalid format”. This typically signifies an issue with the format of the SSH key pair, specifically the public key. This article aims to provide a comprehensive guide to troubleshooting this error, discussing its probable causes and proposing solutions to…

In today’s fast-paced, ever-evolving world, the mobile application development industry is no exception to this constant evolution. As technology advances, developers have at their disposal a variety of robust tools, technologies, and frameworks for Android application development. This article will highlight the top five Android development frameworks in 2023 that are helping developers build more engaging, powerful, and efficient apps. 1. Flutter Flutter, an open-source UI toolkit from Google, has emerged as one of the top choices for Android development. With Flutter, developers can build natively compiled applications for mobile, web, and desktop platforms from a single codebase. Flutter is…

As we delve into the world of network administration, we frequently encounter SSH (Secure Shell) for secure data communication, remote command-line login, remote command execution, and other secure network services between two networked computers. SSH provides robust authentication and secure data communication over insecure channels, making it a favorite among system administrators. However, one frequently faced challenge in this domain is SSH timeouts. Let’s decode what it is and how to disable it for seamless and continuous connections. Understanding SSH Timeout SSH Timeout, as the name implies, refers to the idle time after which the SSH server ends an SSH…

Securing your server is important to keep it safe from unwanted access. One simple way to do this is by allowing only SSH connections to your server. SSH (Secure Shell) is a secure way to connect and manage your server remotely. You can use a tool called iptables, which is like a traffic controller for your server, to block all connections except SSH. This means only people with permission can access your server using SSH, keeping it safe from others. In this guide, we’ll show you how to set up iptables to allow only SSH access, making your server more…

Handling files is a key skill in learning Linux, especially when you need to delete lines that match a certain pattern. You can do this using tools like grep, sed, and awk on the command line. In this article, we’ll show you how to use these tools to search for and remove specific lines from a file in Linux. Before you start: Always make a backup of your files before making changes. Remember, there is no ‘undo’ button in the command line, so if you delete something by mistake, you won’t be able to recover it. 1. Using grep grep…

Linux, a robust, flexible, and open-source operating system, is a favorite among many system administrators and developers due to its powerful command-line tools. One important ability of these tools is the manipulation of files, including the deletion of specific lines from a file. This article will serve as a practical guide to deleting specific lines from Linux files using different commands like sed, awk, and grep. Understanding File Line Deletion Deleting lines from files is a routine task, especially when dealing with large data or log files. It is often necessary to remove unnecessary or irrelevant data. This task can…

In this article, we will discuss multiple ways to delete the last N lines from a file in Linux. For this purpose, we will use various Linux utilities like sed, awk, and head. Before we proceed, it’s important to mention that manipulating files directly on a Linux system can potentially be destructive if not done properly. Always make sure you have a backup of your file before performing these operations, especially if the file contains important data. 1. Using the head command The head command in Linux is used to print the top N number of data of the given…

The Power-On Self-Test, commonly known as POST, is a critical part of a computer’s startup sequence. This built-in diagnostic program checks your computer’s hardware to ensure everything is functioning correctly before the operating system begins to load. What is POST? POST is a process run by firmware or software on a computer and other devices, typically as soon as the machine is powered on. The primary purpose is to test various system components and ensure they’re functioning properly before booting the main operating system. This process is executed by the system’s Basic Input/Output System (BIOS) or, in modern systems, by…