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An Application Programming Interface (API) contains software building tools, subroutine definitions, and communication protocols that facilitate interaction between systems. An API may be for a database system, operating system, computer hardware, or a web-based system. An API makes it simpler for programmers to use certain technologies to build applications. APIs can include specifications for data structures, variables, routines, object classes, remote calls, and more. API Architecture Application A (User Interface) Application B (Mobile App) ... Read More
Zypper is the command-line package manager for SUSE Linux and openSUSE distributions. It provides a comprehensive set of tools to install, update, remove, and manage software packages on your system. This article covers 25 essential Zypper commands that will help you efficiently manage your SUSE Linux package management system. Basic Package Operations 1. Installing Packages To install packages using Zypper − sudo zypper install For example, to install Firefox browser − sudo zypper install firefox 2. Removing Packages To remove a package using Zypper − ... Read More
File sharing is the practice of distributing or providing access to digital files between two or more users or devices. While it is a convenient way to share information and collaborate on projects, it also comes with risks such as malware and viruses, data breaches, legal consequences, and identity theft. Protecting files during sharing is essential to ensure confidentiality, integrity, and availability. File sharing refers to the process of sharing or distributing electronic files such as documents, music, videos, images, and software between two or more users or computers. It plays a vital role in facilitating collaboration and communication ... Read More
Nagios is an open-source monitoring system that helps system administrators monitor the performance and availability of various network resources, including hosts, services, and network devices. NRPE (Nagios Remote Plugin Executor) is a plugin used to monitor remote hosts or devices from the Nagios server by executing monitoring plugins on the remote host and returning results to the Nagios server. This guide demonstrates how to add a Linux host to your Nagios monitoring infrastructure using the NRPE plugin for comprehensive system monitoring. Prerequisites Before beginning the setup, ensure the following requirements are met: Nagios Core installed ... Read More
Ansible is a widely-used open-source tool that helps in automating software provisioning, configuration management, and application deployment. One of its powerful features is the ability to use variables and facts, which can simplify your playbooks and tasks, and allow you to design more dynamic, flexible, and reusable automation scripts. In this article, we'll dive into how to work with Ansible variables and facts, showcasing several examples and their corresponding output. Understanding Ansible Variables Variables in Ansible allow for the storage and manipulation of values, which can be utilized across multiple tasks or even different playbooks. Variables can ... Read More
In order to test a crontab job we first need to explore and understand what a crontab job is. A crontab job is nothing but a list of commands that we can run during a cron job. A cron job is a utility that schedules automatic execution of commands at specific times. We can start a cron job with the help of bash script by following the commands shown below − crontab -e This will open a file which you can edit, insert the cron job shell script in the above file and then ... Read More
A modern computer system consists of the following components − One or more processors Main memory Storage devices (disks) Printers and other output devices Various input/output devices To manage all these components effectively, we require a layer of software called the Operating System (OS). An Operating System is a program that acts as an intermediary or interface between computer users and the computer hardware. It is the most important type of system software in computer systems. Without an operating system, users cannot run application programs on the computer system. OS Interface Structure The ... Read More
Linux offers an extensive collection of file managers and explorers that cater to different user preferences and system requirements. This comprehensive guide explores 25 of the best options available, covering both graphical (GUI) and command-line (CLI) solutions to help you find the perfect file management tool for your workflow. GUI File Managers Nautilus (GNOME Files) Nautilus serves as the default file manager for GNOME desktop environments and comes pre-installed with most GNOME-based Linux distributions. This intuitive file manager provides seamless navigation through files and folders with support for tabs, bookmarks, integrated search functionality, and cloud storage integration. ... Read More
As a Linux user, it's common to run the same command in multiple directories. For example, you might want to search for all files with a certain extension or run a shell script in multiple directories. This task can be time-consuming if done manually, and becomes even more tedious as the number of directories increases. Fortunately, Linux provides several methods for running a command across multiple directories efficiently. Using the Find Command to Execute Commands The find command is one of the most powerful commands available in Linux. It allows you to search files and directories based on ... Read More
Fedora is a popular Linux distribution that offers flexibility in customizing your system, including the ability to add custom fonts. Fonts play an important role in the overall look and feel of documents, presentations, and applications. This article will guide you through the process of installing new fonts in Fedora. Why Add New Fonts in Fedora? While Fedora comes with a good collection of default fonts, you may need additional fonts for specific purposes such as graphic design, coding, or multilingual support. Custom fonts can add a personal touch to your work and improve readability for different use ... Read More