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Cron is a scheduling daemon that allows you to schedule the execution of tasks at specified intervals. These tasks are called cron jobs and can be scheduled to run by a minute, hour, day of the month, month, day of the week, or any combination of these.

curl is a powerful command-line tool for transferring data from or to a remote server. With curl you can download or upload data using various network protocols, such as HTTP, HTTPS, SCP, SFTP, and http://FTP.

Elasticsearch is an open-source distributed full-text search and analytics engine. It supports RESTful operations and allows you to store, search, and analyze big volumes of data in real-time. Elasticsearch is one of the most popular search engines powering applications that have complex search requirements such as big e-commerce stores and analytic applications. This tutorial covers the installation of Elasticsearch on CentOS 8.

This guide explains how to build Python 3.8 on CentOS 8 from the source code. We’ll also show you how to create a virtual environment.

Decision making is one of the most fundamental concepts of computer programming. Python supports the common flow control statements found in other languages, with some modifications. The if control statement is one of the most basic and well-known statements that is used to execute code based on a certain condition.

The Bash sequence expression generates a range of integers or characters by defining a start and the end point of the range.

Redis is an open-source in-memory key-value data store. It can be used as a database, cache and, message broker and supports various data structures such as Strings, Hashes, Lists, Sets, and more. Redis provides high availability via Redis Sentinel and automatic partitioning across multiple Redis nodes with Redis Cluster. This guide covers the installation and configuration of Redis on CentOS 8.

Vim keeps track of all the changes you made in the current session. The undo command undoes one or more changes in the order in which they were made.

Apache Maven is an open-source project management and comprehension tool used primarily for Java projects. Maven uses a Project Object Model (POM), which is essentially an XML file containing information about the project, configuration details, the project’s dependencies, and so on.

The kernel is the core component of an operating system. It manages the system’s resources, and it is a bridge between your computer’s hardware and software. lsmod is a command-line utility that displays information about the loaded Linux kernel modules

Xrdp is an open-source implementation of the Microsoft Remote Desktop Protocol (RDP) that allows you to graphically control a remote system. With RDP, you can log in to the remote machine and create a real desktop session the same as if you had logged in to a local machine.

Python has a few built-in modules that allow you to delete files and directories. This tutorial explains how to delete files and directories using functions from the os, pathlib, and shutil modules.

Virtual Network Computing (VNC) is a graphical desktop sharing system that allows you to use your keyboard and mouse to remotely control another computer. This article covers the steps to install and configure a VNC server on CentOS 8. We’ll also show you how to securely connect to the VNC server through an SSH tunnel.

A server block is an Nginx directive that defines settings for a specific domain, allowing you to run more than one website on a single server. This article describes how to set up Nginx server blocks on CentOS 8.

The select construct allows you to generate menus.

Loops allow you to run one or more commands multiple times until a certain condition is met. However, sometimes you may need to alter the flow of the loop and terminate the loop or only the current iteration. In Bash, break and continue statements allows you to control the loop execution.

timeout is a command-line utility that runs a specified command and terminates it if it is still running after a given period of time.

Ruby is one of the most popular languages today. It has an elegant syntax, and it is the language behind the Ruby on Rails framework. We'll show how to install Ruby from the default CentOS 8 repositories and using the Rbenv and RVM scripts.

tcpdump is a command-line utility that you can use to capture and inspect network traffic going to and from your system

Pip is a package management system that allows you to install, remove, and otherwise manage software packages written in Python. It can be used to install packages from the Python Package Index (PyPI) and other indexes. In this tutorial, we will explain how to install pip for Python 2 and 3 on CentOS 8 and cover the basics of how to manage Python packages with pip.