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Introduction Sed, also known as the "stream editor", is a powerful command-line tool on Linux that allows you to perform basic text transformations on an input stream (either a file or input from a pipe). Sed is especially useful for making bulk changes to large numbers of files, or for editing files that are difficult to open with a text editor. This guide will serve as a detailed introduction to sed, including its syntax, basic commands, and examples of how to use sed in different scenarios. We'll also explore advanced features like grouping and in-place editing to help you master ... Read More
We can add a stateful component without using a constructor class by using the useState hook. This hook allows us to create and update state within our component without the need for a constructor. To use this hook, we simply call the useState function and pass in our initial state as an argument. There are primarily two ways of creating React Components − Using JS classes. Using functional components. Before react v16 there was no way of adding state to functional components. But since the inception of React Hooks we can write stateful functional components as well. A ... Read More
Introduction On Linux, a shebang (#!) is a special line at the beginning of a script that tells the operating system which interpreter to use when executing the script. This line, also known as a hashbang, shabang or "sharp-exclamation", is the first line of a dash and starts with "#!" followed by the path to the interpreter. The Shebang line is important because it allows you to run scripts written in any language, not just shell scripts, on a Linux system. Understanding Shebang What is a Shebang? The Shebang “#!” The symbol indicates which interpreter, or which version of an ... Read More
Introduction The nslookup command is a tool used to query Domain Name System (DNS) servers and retrieve information about a specific domain or IP address. This command is an essential tool for network administrators and system engineers as it can be used to troubleshoot DNS issues and gather information about DNS configurations. In this article, we'll explore the nslookup command on Linux in depth, including its syntax, options, and examples of how it can be used to troubleshoot DNS issues. We will also discuss the prerequisites for using the nslookup command and how to install it on various Linux distributions. ... Read More
Introduction Transferring files between Linux machines over SSH is a common task for system administrators and developers. SSH (Secure Shell) is a protocol that allows you to securely transfer files between machines, as well as remotely access and manage them. In this article, we will explore different ways to transfer files over SSH and demonstrate the process with examples and commands. Setting up SSH Before you can transfer files over SSH, you need to set up SSH on both the source and destination machines. SSH is a secure communication protocol that allows you to remotely access and manage your Linux ... Read More
We can add a star rating feature in NextJS by using a library such as react-star-rating. This library allows us to easily display a star rating system and allows for customization of the number of stars and the ability to handle user interactions.Next.js is an open-source web development framework. The Next.js is React Based framework with server side rendering capability. Both speed and SEO are excellent. You can simply build and test sophisticated react-based applications using Next.js. Next.js is written in Typescripts. It offers a Link component that links other components together and has a prefetch property that allows for ... Read More
Introduction On the Linux operating system, the "uniq" command is used to remove duplicate lines from a sorted file. However, sometimes you may need to remove duplicates based on a specific column, rather than the entire row. This becomes particularly useful when working with column-based input files, such as CSV files. In this article, we'll explore several ways to do this per-column "uniq'ing" on Linux. Method 1: Use sort command The sort command is a simple and effective way to sort rows by a specific field and remove duplicates from the sort result. For duplicates, only the first instance will ... Read More
Introduction The Linux Terminal is a powerful tool that allows users to interact with the operating system through the command line. However, the terminal's default output color can be dull and unattractive. In this article, we will discuss several ways to change the terminal output color in Linux. We'll cover the use of different commands and tools that can be used to customize the terminal's color scheme, as well as some examples of how to use them. This guide is intended for Linux users who want to improve their terminal experience by changing the output color. Using the "LS" command ... Read More
Introduction In this article, we will discuss how to shut down and restart Linux systems from the terminal. The ability to shut down and restart a system from the command line can be useful in a variety of situations, such as when the GUI is unavailable or when automating tasks via Linux shell scripts. Overview Linux is a fairly robust operating system, and as such, rebooting Linux servers is rarely necessary. However, sometimes there are reasons why you need to restart your system. For example, if we are running Linux on our personal computer, restarting and shutting down the system ... Read More
What is a string and a substring? A substring in Go is a portion of a larger string. It is specified by providing a start index and a length, and it contains the characters of the original string starting at the start index and going up to the specified length. The characters in a substring are still a part of the original string and share the same memory. In Go, a string is a sequence of characters. It is an immutable data type, meaning that once a string is created, it cannot be modified. Strings are enclosed in double quotes ... Read More