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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to Convert an Image to Grayscale From Bash?
Converting images to grayscale is a common image processing task that can be easily accomplished using command-line tools in Bash. This tutorial will show you several methods to convert images to grayscale using popular image manipulation utilities. Using ImageMagick ImageMagick is one of the most powerful and widely used command-line tools for image manipulation. Before you can use it, you must install it on your system. In Ubuntu, you can install it using apt as − # Debian/Ubuntu $ sudo apt install imagemagick # RedHat/CentOS $ sudo dnf install ImageMagick After installation, here are some of the methods ...
Read MoreHow to Add File Extension to Files From Bash?
In an operating system, file extensions usually help identify file types and ensure proper handling by applications. When working with files in a Unix-like operating system including Linux, you may encounter situations where files sometimes lack extensions, making it difficult to identify their types or open them with the appropriate applications. Fortunately, Bash, the default shell on many Linux distributions, provides powerful tools to simplify the process of adding file extensions. This tutorial will guide you through various options that you can use to add file extensions to files using Bash. Adding File Extension using the mv Command The simplest ...
Read MoreHow to Install Artix Linux in VirtualBox?
Artix Linux is a fast, customizable and user-friendly Linux distribution based on Arch Linux. It is now more stable and secure than its predecessors while using real init systems instead of systemd. Artix Linux can be installed either by console (text-based) or GUI installer. Although GUI installers are an easier and faster option at least for beginners and novice users. In this article, we'll cover installation of Artix Linux via GUI installer method. Besides there are some pre-requisites that you need to have on your system before beginning the installation, which we'll cover next. Prerequisites Ensure that VirtualBox is installed ...
Read MoreHow to Configure CentOS Local Yum Repository?
Yum repository is a central database of software that is used for installation/upgrade of packages on a Red Hat/CentOS based Linux server. This repository includes software that are used by system as well as for user level programs. An administrator can set-up a custom local yum repository instead of using the default ones provided by the OS for several reasons like: to provide normal or specialized software packages possibly in a restricted network environment; to maintain version levels across a set of servers; to optimize network bandwidth usage; to adhere to organization policy for maintaining security or possibly a combination ...
Read MoreHow to Change Apache Port in Linux?
Apache HTTP server (often called Apache) is an open-source, cross-platform web server developed by Apache Software Foundation. It is one of the most popular web servers available used for hosting web sites and serving web content. By default, Apache works on port 80/tcp for HTTP and 443/tcp for HTTPS. There are situations (like security considerations, port conflicts with other programs or need to run multiple web servers) where one may need to modify these default ports which the web server listens on. Changing Apache Port on Linux Read this tutorial to learn how to change HTTP port for Apache on ...
Read MoreJava NumberFormat.getPercentageInstance() Method
In this article, we will learn the NumberFormat.getPercentageInstance() method. Java provides powerful tools for formatting numbers, currencies, and percentages through the java.text.NumberFormatclass. One of the most useful methods in this class is the getPercentageInstance() method. NumberFormat.getPercentageInstance() method The NumberFormat.getPercentageInstance() method is a static method that returns a NumberFormat instance configured to format numbers as percentages. This method can be used with or without a Locale parameter. Syntax − public static NumberFormat getPercentageInstance()public static NumberFormat getPercentageInstance(Locale locale) Without Locale: If no locale is specified, the method uses the default locale of the JVM. ...
Read MoreJava ResultSet getType() Method with Example
In JDBC (Java Database Connectivity), the ResultSet interface represents the result set of a database query in Java. One of the important methods provided by ResultSet is getType(), which returns the type of the ResultSet object. Result getType() method The getType() method is used to determine the type of cursor and its behavior when scrolling through the result set.Syntax of getType() int resultSet_Type = rs.getType(); This method returns an integer value that corresponds to one of the ResultSet type constants. These constants indicate the type of cursor used by the ResultSet: ResultSet.TYPE_FORWARD_ONLY (value: 1003): This ...
Read MoreGet the union of two sets in Java
The union of two sets combines all the unique elements from both sets into one. In Java we can achieve this using the HashSet class, which ensures no duplicate elements. This article will demonstrate two approaches to finding the union of two sets. Different Approaches Following are the two different approaches to getting the union of two sets in Java − Using the addAll() Method Using Streams Using the addAll() Method The simplest way to find the union of two sets is by using the addAll() method of the HashSet class. This ...
Read MoreHow to create a B-Tree in DBMS?
A B-tree is a self-balancing tree in data structures that allows efficient storage of sorted data. Each node can hold multiple keys and have many child nodes. B-trees are versatile data structures that can efficiently handle large amounts of data. However, traditional binary search trees become inefficient for storing and searching large datasets due to their lower performance and high memory usage. B-trees, balanced trees, are self-balancing trees designed to overcome these limitations. B-trees are characterized by the large number of keys that can be stored in a single node, often called "large key" trees. Each node in a ...
Read MoreSQL Query to Get Column Names From a Table
In this article, we are going to learn how to get column names from a table using an SQL query. If you don't know what SQL is, keep reading because everything is covered from scratch. SQL stands for Structured Query Language, which is used to interact with databases. Basically, queries are used to perform CRUD operations on databases. Steps to Retrieve Column Names Here is the step-by-step explanation of getting columns from a table. Step 1: Check Database First, check the database where the table exists. If the database does not exist, run the following query to create it. CREATE ...
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