linux 🍹

A collection of 57 posts

ethical hacking 🤖

Using Wireshark to Sniff and Capture Credentials in an Unsecured HTTP protocol.

Wireshark needs no introduction... It's one of the most popular network protocol analyzers to date. It's a powerful network protocol analyzer used by network administrators, security professionals, and developers for network troubleshooting, analysis, software development, education, and more.

how to 🪄

Using apt-get || apt command.

This guide outlines the capabilities of apt-get or apt commands in Linux, explaining how to utilize them for tasks such as discovering new packages, installing and upgrading them, and maintaining system cleanliness.

how to 🪄

How to automatically Backup Your Files to a Remote Server with Rsync.

The Rsync command on Unix-like operating systems synchronizes files from a source to a destination, either locally or remote network connection. Rsync is a file-copying program that is both quick and flexible.

linux 🍹

Throw Insults when a user type the wrong password.

SUDOERS — default SUDO security policy module —— "insults If set, sudo will insult users when they enter an incorrect password. This flag is off by default."

how to 🪄

What are Zombie processes and how get rid of them?

You may have seen zombie processes shambling around your processes list. A Zombie process is called as such because it’s already dead. You know... ZOMBIE.

how to 🪄

How to Clear Buff/Cache in Linux?

RAM memory Cache is a type of memory that stores accessed data to speed up the performance of the system and provide a better and faster experience to the user.

how to 🪄

Query the systemd Journal?

journalctl is a utility for querying and displaying logs on systemd, kernel and journal on journald written by systemd-journald.service. See our previous post on Systemd journal. Working with journalctl command 1. All logs When run without any parameters, the following command will display all the logs in the paginated

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

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

how to 🪄

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

how to 🪄

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.

how to 🪄

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.

linux 🍹

/etc/skel directory.

skel is derived from the skeleton because it contains the basic structure of the home directory. The /etc/skel contains files and directories that are automatically copied over to a new user's home directory when such user is created by the useradd program, thus making certain that all

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

tips 🪤🎉

How to Remotely Reboot your Server.

This is the fifth 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...

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.

Somehow confused about when to use one over the other su and sudo commands? Well, this article will help you sort them out.

how to 🪄

Most efficient way to Empty File Content in Linux.

In some situations, you might want to empty an existing file to a zero-length. In another word, removing the file contents without deleting the file. Is that even possible?

how to 🪄

Using Monit to Monitor Linux Daemon, CPU, Filesystem, Network and Files on Ubuntu Server.

Services on any server must be operational and perform their duties effectively. It is critical to monitor the overall state of your server, including processes, programs, directories, files, and so on. This is known as system monitoring.