Author: Rahul

I, Rahul Kumar am the founder and chief editor of TecAdmin.net. I am a Red Hat Certified Engineer (RHCE) and working as an IT professional since 2009..

Write a Java program to get keys from the hashmap using the value. The HashMap class is available under the java.util package. It is pretty similar to HashTable, but the HashMap is unsynchronized and also allows to stole one null key. In this tutorial, you will learn Java examples to get keys from a HashMap based on a defined value. Get Key for a Value in HashMap The Entry interface provides a number of methods to access key values from a HashMap. The Entry.getValue() method returns the value based on the provided key. Here is an example Java program to…

Read More

An array is a data structure to store multiple elements of similar data types. Similar to other programming languages Java also supports Arrays. An Array is always stored in a contiguous location on the system memory. Java provides multiple methods of printing an Array basis on the requirements. We can directly access any array of elements with the index number or print the entire Array using Java loops. In this tutorial, you’ll learn different techniques to print the elements of a given array in Java. Arrays.toString() method Arrays.deepToString() method for Loop for-each Loop Arrays.asList() method Let’s discuss the above methods…

Read More

GitHub is a popular platform for hosting Git repositories, and it supports accessing repositories over SSH (Secure Shell). In order to access a GitHub repository over SSH, you will need to generate an SSH key pair and add the public key to your GitHub account. Here are the steps for adding a new SSH key to your GitHub account: Prerequisites Before you can add an SSH key to your GitHub account, you will need to do the following: Generate an SSH key pair. This consists of a private key and a public key. The private key is kept on your…

Read More

Amazon Web Services’ Simple Storage Service (Amazon S3) is a highly reliable and scalable cloud storage solution. It offers cost-effective storage that’s extensively utilized for data backup and hosting static website content. Leveraging Amazon S3, users can efficiently store and manage vast amounts of data with ease. For those looking to manage their S3 buckets and contents seamlessly, the AWS Command Line Interface (AWS CLI) is an indispensable tool. This guide will teach you how to back up your website to an Amazon S3 bucket using a shell script, enhancing your data management and website maintenance processes. Step 1: Installing…

Read More

A Windows service is a background process that runs in the background of your Windows computer. It can run in the system tray, so it can be started and stopped at any time. You can create a Windows service programmatically using the ServiceController object or by using the Windows Services application. A Windows service does not have to start as a result of user action; it can also be started automatically when certain conditions are met, such as when the computer boots, or when an application is launched. We can start/stop/restart any Windows service in two ways. One is to…

Read More

Data blocks and inodes are the two elements of a file system in Linux. Once the file is created, you cannot change the number of blocks. Inodes are allocated to files written in Linux filesystems. The filesystem’s database employs these unique Identification numbers to keep track of the files. They handle a file’s information and are critical components of Linux architecture. In this article, we will study inode numbers in detail. What is inode number in Linux In Linux, whenever a new file is created, it is given a file name and an inode number. This number works as the…

Read More

GitHub Actions provides a powerful toolset for automating, customizing, and executing your software development workflows right in your repository. It allows you to build, test, and deploy your code directly from GitHub. But what if you’re working with a monorepo, or your workflow lives within a subdirectory of your repository? In this article, we will guide you through the process of running GitHub Actions within subdirectories, ensuring you maximize the potential of your development workflow. What You Will Need To follow this guide, you will need: A GitHub account with access to the repository you wish to work on. A…

Read More

A hostname serves as a unique identifier for a device within a network, essential for network administration and management. This distinctive label allows for easy identification and communication within network environments. If you’re looking to update your network settings or manage multiple devices, changing the hostname on a Windows computer or server is a crucial step. Before proceeding with the hostname modification on your Windows machine, it’s important to save all open documents and prepare for a system reboot. This process is particularly important for IT professionals managing production servers, as changing the hostname on such systems requires careful timing…

Read More

There are 350 plus kali Linux tools that are used to automate our tasks during hacking and penetration testing. To increase time efficiency, Kali Linux tools are used that are already included in different versions of Kali Linux. They not only save time but also help us in getting the specific result by capturing accurate data. Here we describe the top 10 kali Linux tools that help us in hacking. TOP 10 KALI LINUX TOOLS: Nmap (Network Mapper) Wireshark John the Ripper THC Hydra Better cap Autopsy Sqlmap Burp Suite Scanner Lynis Netcat 1. Nmap (Network Mapper): Network Mapper also…

Read More

NVM (Node Version Manager) is the command-line utility for installing Node.js on your system. It allows us to install multiple Node.js versions and switch between them. This is helpful for the system running multiple Node applications that required different-2 node versions. This tutorial will help you to install and manage multiple Node.js versions on Windows using NVM. How to Install NVM on Windows The coreybutler has build the nvm installer for the Windows systems. Visit the below link to download the NVM installer for the Windows systems. https://github.com/coreybutler/nvm-windows/releases And download the nvm-setup.zip file of the latest version. Extract the downloaded…

Read More