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Working with files on Linux often involves comparing or analyzing multiple files at once. A useful way to do this is to view the files side by side in the terminal, allowing for easy comparison and analysis. This article explores various methods to view files side-by-side on Linux, including the diff and sdiff commands, as well as text editors like vim and emacs. Using the diff Command The diff command is a standard Linux utility that compares two files and displays the differences between them. By default, it shows a unified diff format, but can display files side ... Read More
Java is a popular programming language widely used for developing various types of software applications. Linux is one of the most popular operating systems for software development due to its stability, security, and open-source nature. In this article, we will discuss how to install Java on Linux using SSH. SSH (Secure Shell) is a secure network protocol used for remote login to a server. It allows users to log in to a remote server and perform various operations using command-line tools. This makes it an excellent choice for installing Java on a Linux machine. We will be using the ... Read More
The ifconfig command is an essential network administration tool in Linux systems used to configure network interfaces and display network interface parameters. It allows system administrators to view current network configuration, assign IP addresses, enable/disable interfaces, and modify various network settings from the command line. Syntax The basic syntax of the ifconfig command is − ifconfig [interface] [options] Where interface specifies the network interface name (e.g., eth0, wlan0), and options define the actions to perform. If no interface is specified, ifconfig displays information for all available interfaces. Common Options Interface Control ... Read More
When you install RHEL/CentOS 8 Minimal, the system comes with a minimal set of pre-installed packages and services to keep the system lightweight and secure. However, over time, as you install new packages and services, your system can become bloated and vulnerable to security threats. In this article, we will discuss how to disable and remove unwanted services and packages on RHEL/CentOS 8 Minimal installation. We will start by identifying unnecessary services and best practices for disabling them to ensure that your system remains secure and functional. Additionally, we will discuss how to remove any packages that are no ... Read More
A computing environment refers to the platform or framework where computer programs are developed, deployed, and executed. It encompasses the hardware, software, network infrastructure, and operational procedures that support computing activities. Different computing environments are designed to meet specific requirements for performance, scalability, mobility, and resource sharing. The computing environment determines how resources like CPU, memory, storage, and network are allocated and managed. Modern operating systems support multiple computing environments to accommodate diverse user needs and technological requirements. Types of Computing Environments Traditional Computing Traditional computing involves standalone desktop or server systems where applications run locally ... Read More
WAR (Web ARchive) files are compressed archives used to package Java web applications for deployment. Since WAR files are essentially ZIP archives with a .war extension, they can be extracted using standard Linux command-line tools. This article demonstrates how to extract WAR files on Linux using two primary methods. A WAR file contains all components needed for a web application, including HTML pages, CSS stylesheets, JavaScript files, Java classes, configuration files, and libraries. Extracting these files allows developers to inspect, modify, or troubleshoot web applications. Prerequisites Before extracting WAR files, ensure you have the following tools installed ... Read More
An electric motor is an energy conversion device that converts electrical energy into mechanical energy. Therefore, the input to an electric motor is electricity, while the output of the electric motor is mechanical energy in the form of rotation of the shaft. Based on the type of electrical energy that motor requires to operate, the electric motors are classified into two types, i.e. AC Motor and DC Motor. An AC Motor or alternating current motor is one that transforms electrical energy in the form of alternating current into rotational mechanical energy. On the other hand, an electric motor ... Read More
Apache web server directory listing allows users to view the contents of a directory when no index file is present. While this can be useful for file sharing with trusted users, it poses significant security risks by exposing sensitive files to the public. Directory listing can reveal configuration files, backup files, and other resources that should remain private. This article explains how to disable Apache web directory listing using the .htaccess file. The .htaccess (hypertext access) file is a configuration file that controls various aspects of Apache's behavior at the directory level without requiring server-wide configuration changes. Prerequisites ... Read More
Linux provides several powerful methods to count the number of files in a directory. This is an essential skill for system administrators, developers, and Linux users who need to manage large datasets, perform system maintenance, or analyze directory contents. Understanding these techniques helps you efficiently handle file management tasks from the command line. Method 1: Using ls Command with grep and wc The ls command combined with grep and wc provides a reliable way to count regular files while excluding directories and special files. ls -l | grep "^-" | wc -l This command ... Read More
Linux provides numerous built-in commands to gather detailed system and hardware information, essential for troubleshooting, performance monitoring, and system administration. These commands allow administrators and users to inspect everything from basic system details to comprehensive hardware specifications without requiring external tools. Basic System Information Commands uname - System Information The uname command displays fundamental system information including kernel version, architecture, and operating system details. $ uname -a Linux hostname 5.4.0-74-generic #83-Ubuntu SMP Sat May 8 02:35:39 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux uptime - System Runtime Shows how long ... Read More