linux 🐧

Unlock the full potential of Linux with tutorials covering everything from basic commands to advanced system administration. Our "Linux" tag includes guides on system setup, configuration, troubleshooting, and optimization, ideal for beginners and seasoned users aiming to enhance their proficiency in the Linux environment.

how to 🪄

How to change Sudo Session's Time Limit.

The sudo command allows us to securely perform great administrative tasks. However, after some time running a command with sudo, will prompt for a password. Because of the 15 minutes grace period; your sudo session has by default. When the 15 minutes are out, you’ll be forced to reenter

linux 🐧

APT vs Snap: What the, what the hell ...

In Linux, package managers are software tools that assist users in searching, downloading, installing, removing, and updating software packages on their system and can be accessed by either Command-Line or through a Graphical User Interface application. There is a variety of package managers to choose from, including dpkg (Debian Package

linux 🐧

Mail Terminology.

Client and server components There are different components involved in an email transmission from sender to recipient. MUA (Mail User Agent) Client application that allows receiving and sending emails. It can be a desktop application such as Microsoft Outlook/Thunderbird/… or web-based such as Gmail/Hotmail/… (the latter is also

how to 🪄

How to install Fing on Ubuntu Debian Servers.

The Fing Command Line Interface (Fing CLI) is a standalone program that provides a set of very handy network troubleshooting tools (NIC information, scan, ping, traceroute, and so on). Installation The software has been packed using Debian (DPKG) and Read Hat (RPM) package manager. Below is the Architecture supported: • i686

tips

How to Remove/ Disable Zsh History' Commands on Linux.

This is the ninth in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

how to 🪄

Using the SSH Client Config File ~/.ssh/config.

Imagine you have to regularly connect to +15 remote systems over SSH. That means to remember all of the remote IP addresses, different usernames, non-standard ports, what authentication keys to use, and various command-line. Quite a big waste of time. Fortunately, SSH allows you to generate a config file that

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issues 🛠

Issue : “Gmail Authentication failed. Please check your username/password” Error. Also known as the “Server response: 534-5.7.14 Error”

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SSH Key-Based Authentication & how to SSH *Without a Password.

So how do you remotely connect to a Linux system? There are multiple available tools out there for remote logins but when it comes to Linux, SSH is the unicorn choice. The Secure Shell (SSH) is a protocol that /provides a secure encrypted connection between two hosts over an insecure

linux 🐧

Difference between apt upgrade, apt full-upgrade, and do-release-upgrade.

There's an apt upgrade, apt full-upgrade, and do-release-upgrade command. Whaaaaaaaaat _ Well..., don't confuse the three commands to upgrade a Debian- or Ubuntu-based machine as they do different things. Confusing _ That's why we are here for _ seat and relax, let us jump right in. apt

linux 🐧

SYN-SYN-ACK and ACK 🤝

Understanding TCP Flags TCP flags are used to indicate a particular state during a TCP conversation. TCP flags can be used for troubleshooting purposes or to control how a particular connection is handled. Each of them has its own significance. They initiate connections, carry data, and tear down connections. Commonly

terminal

49 Most-Used Linux Commands You Should Know.

The Linux command line is a text-based computer interface. It's also known as the Shell, Terminal, Console, CLI, or Prompt, just to name a few. Any graphical user interface (GUI) is nothing more than a graphical representation of command-line applications.

issues 🛠

Issue installing apache2 in Ubuntu 22.04: dpkg:- error processing package javascript-common (--configure):

When files in a package are modified or accidentally removed, it can damage the system. Installing the package again resolves the problem in most cases. However, using the apt install command will return an error, given that the package is already present. Here’s the error: $ sudo apt install apache2

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How to: Use Postfix to Outbound Email as Gmail Relay on Ubuntu - 2-step verification (Update !!!)

Postfix is a mail transfer agent (MTA) a software that implements Simple Mail Transfer Protocol (SMTP). They transport E-Mail messages from one computer to another. MTAs talk to other MTAs, and either * deliver mail locally * or hand it off for delivery to an mail delivery agent (MDA)/LDA if it

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Upgrade from Ubuntu 20.04 LTS to 22.04 LTS Server

Ubuntu 22.04 is a Long-Term Support (LTS) release and will receive ongoing app updates and critical security fixes for the next five years. New Linux kernel releases and graphics driver updates are also rolled out as software updates every six months or so. Ubuntu 22.04 brings a ton

tips

Ghost 5+ -- How to Migrate From MariaDB 10.x to MySQL 8.x

This is the sixth in a series of posts featuring Protips, tips, tricks, hacks, and secrets provided by Our Team 🙊 — We want to share our top tips for the growing and thriving Linux community out there. Because sometimes you need a little help...

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Build and Install htop 3 on Ubuntu.

Htop is a command-line utility that allows you to interactively monitor your running system’s vital resources processes in real-time which are currently managed by the Linux Kernel. It's a little bit like its counterpart 'top' but on steroids.

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How to Enable/Disable Services on Ubuntu Systemd. (Update !!!)

Sometimes we require some services to start up automatically at boot up, such as web servers or ssh, and other times we need to terminate services that we no longer require and are eating CPU and RAM up.

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Managing Users.

Linux is a multi-user operating system, which means that several users can interact the system at the same time. As a system administrator, you are in charge of managing the system's users and groups, which includes adding and deleting users and assigning them to various groups.

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How to Remove Packages Using the Command Line in Linux.

Apt The apt command is a powerful command-line tool, which works with Ubuntu’s Advanced Packaging Tool (APT) performing such functions as installing new software packages, upgrading existing software packages, updating the package, upgrading the entire Ubuntu system, and even removing packages. List installed packages You can list all installed

linux 🐧

Most Useful Nano Commands and Shortcuts.

Working under any Linux Server involves lots and lots of files configuration. Some use Vi, Vim, or Emacs, yet powerful but somehow tedious to learn. For those who need a more simple and versatile text editor, there is nano. GNU nano is a small and friendly text editor. Besides basic

security 🦾🦿

User authentication process.

Have you ever asked yourself how the user authentication process works? Let's jump. What is User Authentication? User authentication is a security process that covers all of the human-to-computer interactions that require the user to register and log in. Simply said, authentication asks each user: 'who the

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tips

How to Remotely Reboot your Server.

linux 🐧

Rsync Command in Linux.

Backup and recovery describe the process of creating and storing copies of data that can be used to protect organizations against data loss. Restoring from a backup typically means putting the data back in its original or another location, ready to replace any lost or corrupted data.

linux 🐧

Hashing, Salting, and Password Storage on Linux.

Whenever you want to check your email, open an SSH session, or even make a purchase on any of your favorite websites, you were prompted to create (and if not too much asked, try to remember it!) a password. It is the first line of defense against unauthorized access to your data.

linux 🐧

The Differences between Sudo and Su in Linux: A Beginner’s Guide.

Confused about when to use su versus sudo? This tutorial will clarify the differences between the two commands, explain when each is appropriate, and guide you on how to use them effectively for better system management and security.