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In this tutorial, we will introduce you to the watch command. Watch is used to run any arbitrary command at regular intervals and displays the output of the command on the terminal window.

Nagios is a popular open source monitoring software. It keeps an inventory of your entire IT infrastructure and ensures your networks, servers, applications, services, and processes are up and running. In case of failure of a critical infrastructure component, Nagios sends notification alerts.

FFmpeg is a free and open source command line tool for transcoding multimedia files. It contains a set of shared audio and video libraries such as libavcodec, libavformat, and libavutil.

On Linux based systems you can use the `df` command to get a detailed report on the system's disk space usage.

TeamViewer is a cross-platform solution that can be used for remote control, desktop sharing and file transfer between computers. TeamViewer is proprietary computer software and it is not included in the CentOS repositories.

Using the correct timezone is important for many systems related tasks and processes. For example, the cron daemon uses the system’s timezone for executing cron jobs and the timestamps in the log files are based on the same system’s timezone.

Steam is a cross-platform entertainment platform developed by Valve Corporation for purchasing and playing video games. It gives you access to thousands of games and allows you to meet new people.

IntelliJ IDEA is a full-featured IDE for JVM and Android Development. It has built-in debugging support, Docker and Docker Compose support, embedded Git control, integrates major build automation tools such as Maven and Gradle, syntax highlighting, code completion, ssh terminal, code refactoring, and rich navigation capabilities.

A reverse proxy is a service that takes a client request, sends the request to one or more proxied servers, fetches the response, and delivers the server’s response to the client.

This tutorial will walk you through the process of creating a bootable CentOS USB stick on Windows. You can use this USB stick to boot and test out or install CentOS on any computer that supports booting from USB.

Let's Encrypt is a free and open certificate authority developed by the Internet Security Research Group (ISRG). Certificates issued by Let's Encrypt are trusted by almost all browsers today. In this tutorial, we will show you how to use the Certbot tool to obtain a free SSL certificate for Nginx on Debian 9. We’ll also show how to configure Nginx to use the SSL certificate and enable HTTP/2.

Zabbix is a mature open source software for monitoring networks and applications. Zabbix can collects metrics from various networks devices, systems, and applications. In case of any failures, Zabbix will send notification alerts via various methods.

Knowing how to add and remove users is one of the basic skills a Linux user should know. In this tutorial, we will show you how to add and remove users on Ubuntu 18.04

This tutorial explains how to install Samba on Ubuntu 18.04 and configure it as a standalone server to provide file sharing across different operating systems over a network.

Branches are part of the everyday development process and one of the most powerful features in Git. Once a branch is merged, it serves no purpose except for historical research. It is common and recommended practice to delete the branch after a successful merge.

Skype is one of the most popular communication applications in the world that allows you to make free online audio and video calls, and affordable international calling to mobiles and landlines worldwide. In this tutorial we will show you how to install Skype on Ubuntu 18.04.

On Ubuntu, the system’s timezone is set during the install, but it can be easily changed at later time. This tutorial demonstrates how to set or change the timezone on Ubuntu 18.04 and previous versions from the command line, or through the GUI. The same instructions apply for any Ubuntu based distribution, including Kubuntu, Linux Mint and Elementary OS.

Ubuntu ships with a firewall configuration tool called UFW (Uncomplicated Firewall). In this tutorial we will show you how to disable the UFW firewall on Ubuntu 18.04 systems.

It’s always a good idea to update your password on a regular basis and use a unique password for each account. As a regular user in Ubuntu you can only change your own password. The root user and users with sudo privileges can change another user’s passwords and define how the password can be used or changed.

In Linux systems, you can create new directories either from the command line or with your desktop file manager. The command that allows you to create directories (also known as folders) is mkdir.