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The default firewall on Ubuntu is ufw, which is short for “uncomplicated firewall.” Ufw is a frontend for the typical Linux iptables commands, but it is developed in such a way that basic firewall tasks can be performed without the knowledge of iptables.

While Ubuntu and Debian come with native applications to open PDF documents by default, some users may prefer to install Adobe Acrobat Reader for its additional features and compatibility. This tutorial will guide you through the process of installing Adobe Acrobat Reader on Ubuntu and Debian. This application will provide enhanced capabilities for opening and managing PDF documents on these Linux distributions.

Monitoring the CPU temperature on RHEL/CentOS systems is crucial for ensuring the optimal performance and longevity of your hardware. Overheating can lead to thermal throttling, reduced lifespan of components, or even system crashes. In this guide, we will explore several methods to monitor CPU temperature, providing you with the tools to keep your system cool and running smoothly.

Installing Google Chrome on CentOS can be a straightforward process if you follow the right steps. Chrome, a popular web browser developed by Google, offers a fast and secure browsing experience. This guide will walk you through the process of installing Google Chrome on your CentOS system, including CentOS 7, 8, 9, and higher, as well as CentOS Stream versions.

Understanding which processes are listening on specific ports in Linux is crucial for system administration and security. This knowledge helps diagnose network issues, secure the system, and ensure services are running as expected. In this article, we’ll guide you through identifying listening ports and the processes using them on your Linux system.

Bash scripting and shell scripting are essential skills for anyone working in a Unix-like environment. Although these terms are often used interchangeably, they refer to different scopes and functionalities. Understanding the nuances between bash scripting and shell scripting can significantly enhance your ability to automate tasks, manage systems, and write efficient code.

Docker is a powerful platform for developing, shipping, and running applications inside containers. However, there are times when you might need to restart Docker or its components for various reasons, such as applying updates, resolving issues, or simply refreshing the environment. This guide will walk you through multiple ways to restart Docker on a Linux system, ensuring your containers and services continue to run smoothly.

In this tutorial, we will explore how to reset a network interface in Linux. Resetting a network interface can help resolve network issues, apply new settings, or refresh the network connection. This process involves bringing the interface down and back up, reloading drivers, and flushing configurations if necessary.

Lsyncd (Live Syncing Daemon) is a free and open source we can use to keep a source and a target directory tree in sync. Written in the LUA programming language, it works by keeping track of filesystem events on the source, and replicating them on the target, typically using tools like rsync and ssh, under the hood. In this tutorial, we learn how to install lsyncd on the most used Linux distributions, and how to configure it to keep local and remote directories in sync.

Removing all files and directories owned by a specific user or group on a Linux system can be crucial for maintaining system integrity and ensuring proper management of user data. Whether you need to clean up resources after removing a user, enforce security policies, or simply free up disk space, understanding the steps to perform this task efficiently and safely is important.

In this article, we will explore various methods to list all available virtual machines (VMs) in VirtualBox using the command line. This will include techniques to list running, stopped, suspended VMs, their states, disk sizes, and more. Command line management of VMs is a powerful way to automate and streamline your virtualization tasks, especially for system administrators and power users.

Resetting the MySQL root password on a Linux server can be a critical task when access to the MySQL server is lost or when setting up a new server. This process involves several steps, including stopping the MySQL service, starting MySQL in a safe mode, and updating the root password. This guide will walk you through each step in detail to ensure you can reset your MySQL root password successfully.

Understanding the filesystem partition type codes on a Linux system is crucial for managing disks and partitions effectively. These codes help identify the type of filesystem and the partitions’ role within the system. This guide will walk you through the steps to list these partition type codes using various command-line tools in Linux.

Removing unused or orphaned packages from your CentOS Linux system can help free up disk space, improve system performance, and reduce potential security vulnerabilities. Orphaned packages are those that were installed as dependencies for other software but are no longer needed because the original software has been removed. This guide will walk you through the steps to identify and remove these orphaned packages effectively.

A reverse proxy server is a type of server that sits in front of web servers and forwards client (e.g., web browser) requests to those web servers. Reverse proxies are typically installed to increase security, performance, and reliability. This tutorial will guide you through the process of setting up Nginx, a high-performance and highly scalable web server, as a reverse proxy on a system running Ubuntu or Debian.

When managing a Linux system, ensuring the security and appropriate permissions of files and directories is crucial. Particularly, being aware of which files and directories have write permissions is important for system security and data integrity. This guide will show you how to use the find command to search recursively through the file system to identify files and directories based on their write permissions.

Disabling logging in NGINX can be useful for various reasons, such as reducing disk usage, improving performance, or simply because you don’t need the logs for a particular application. This guide will walk you through the steps to disable access and error logging in NGINX on a Linux system.

Docker containers are an essential part of modern application deployment and development. Often, there is a need to know the internal IP address of a Docker container for debugging, networking, or integration purposes. This article will guide you through the steps to retrieve the internal IP address of a Docker container using different methods.

In this tutorial, we will explore the various uses of parentheses, brackets, and braces in BASH scripting. These symbols have distinct functionalities and are crucial for writing effective scripts. Understanding their uses can help you in tasks such as arithmetic operations, test constructs, and parameter expansions.

Dealing with CSV files containing empty cells can be challenging, especially when trying to process or analyze data programmatically. In this article, we will explore how to use Bash and the powerful text stream editor sed to fill these empty cells efficiently. This approach ensures that your data is complete and ready for further manipulation or analysis.