Language Selection

English French German Italian Portuguese Spanish

today's howtos

Filed under
HowTos
  • How to install ntopng on Ubuntu 22.04?

    In this post, you will learn how to install ntopng in Ubuntu 22.04. This powerful network monitoring tool is a marvel that we can always install to take advantage of it.

  • What is the /etc/aliases file – TecAdmin

    /etc/aliases is a text file used to store email aliases on a Linux system. Email aliases are basically nicknames for email addresses. They allow you to send emails to a group of people using a single address, or to redirect emails from one address to another.

    /etc/aliases are typically used to store aliases for the system’s mail server. However, it can also be used to store aliases for any other purpose.

    For example, you could use /etc/aliases to create an alias for your own email address. This file is stored in the /etc directory, which is the standard location for system-wide configuration files. /etc/aliases are usually managed by the system administrator. However, you can also edit /etc/aliases yourself if you need to add or change an alias.

  • How to Install LXC to Create Linux Containers on RHEL/CentOS/Rocky Linux

    In this article, I will take you through the steps to install LXC (Linux containers) on RHEL/CentOS/Rocky Linux but before that let’s understand the first LXD. It is a free and open source next-generation system container and virtual machine manager. LXD provides a template that contains images of almost all the major Linux distributions. These images can be used to create Linux containers using the LXC utility. This is a CLI-based client utility provided by LXD. When running a virtual machine, LXD uses the hardware of the host system, but the kernel is provided by the virtual machine. Therefore, virtual machines can be used to run, for example, a different operating system.

  • Finding Your Router’s IP Address (Default Gateway) in Ubuntu and Other Linux

    You probably already know how to get your system’s IP address in Linux.

    But how do you know the IP address of your router?

  • Guide to Web Application Penetration Testing

    Web application penetration testing is a technique that aims at evaluating web applications and gathering information concerning the possible vulnerabilities and security flaws in the system. The technique involves a series of steps that include identifying vulnerabilities and gathering detailed information on how these vulnerabilities could compromise the web application and impact business.

  • How to Cut, Copy and Paste Text in Nano editor?

    GNU Nano is an editor that has a minimal learning curve and hence is widely used for beginner-level guides.

    That doesn't mean that it is as easy to use for beginners as a graphical text editor. Why? because you still have to rely on the keyboard shortcuts to do the basic things such as save, undo, etc.

    How about cut, copy and paste in Nano? Does it require specific keyboard shortcuts too?

    Well, yes and no. You can use the mouse to copy-paste. There are also keyboard shortcuts for the same purpose. To cut, you must use shortcuts.

More in Tux Machines

today's howtos

  • How to Change Comment Color in Vim – Fix Unreadable Blue Color

    Are you annoyed about the comment color in vim? The dark blue color of the comment is often hard to read. In this tutorial, we learn how to change the comment color in Vim. There are few methods we can use to look vim comment very readable.

  • How to Add Repository to Debian

    APT checks the health of all the packages, and dependencies of the package before installing it. APT fetches packages from one or more repositories. A repository (package source) is basically a network server. The term "package" refers to an individual file with a .deb extension that contains either all or part of an application. The normal installation comes with default repositories configured, but these contain only a few packages out of an ocean of free software available. In this tutorial, we learn how to add the package repository to Debian.

  • Making a Video of a Single Window

    I recently wanted to send someone a video of a program doing some interesting things in a single X11 window. Recording the whole desktop is easy (some readers may remember my post on Aeschylus which does just that) but it will include irrelevant (and possibly unwanted) parts of the screen, leading to unnecessarily large files. I couldn't immediately find a tool which did what I wanted on OpenBSD [1] but through a combination of xwininfo, FFmpeg, and hk I was able to put together exactly what I needed in short order. Even better, I was able to easily post-process the video to shrink its file size, speed it up, and contort it to the dimension requirements of various platforms. Here's a video straight out of the little script I put together: [...]

  • Things You Can And Can’t Do

    And it got me thinking about what you can and can’t do — what you do and don’t have control over.

  • allow-new-zones in BIND 9.16 on CentOS 8 Stream under SELinux

    We run these training systems with SELinux enabled (I wouldn’t, but my colleague likes it :-), and that’s the reason I aborted the lab: I couldn’t tell students how to solve the cause other than by disabling SELinux entirely, but there wasn’t enough time for that.

  • Will the IndieWeb Ever Become Mainstream?

    This is an interesting question, thanks for asking it, Jeremy. I do have some history with the IndieWeb, and some opinions, so let’s dive in.

    The short answer to the question is a resounding no, and it all boils down to the fact that the IndieWeb is really complicated to implement, so it will only ever appeal to developers.

  • How to Install CUPS Print Server on Ubuntu 22.04

    If your business has multiple personal computers in the network which need to print, then we need a device called a print server. Print server act intermediate between PC and printers which accept print jobs from PC and send them to respective printers. CUPS is the primary mechanism in the Unix-like operating system for printing and print services. It can allow a computer to act as a Print server. In this tutorial, we learn how to set up CUPS print server on Ubuntu 22.04.

Open Hardware: XON/XOFF and Raspberry Pi Pico

  • From XON/XOFF to Forward Incremental Search

    In the olden days of computing, software flow control with control codes XON and XOFF was a necessary feature that dumb terminals needed to support. When a terminal received more data than it could display, there needed to be a way for the terminal to tell the remote host to pause sending more data. The control code 19 was chosen for this. The control code 17 was chosen to tell the remote host to resume transmission of data.

  • Raspberry Pi Pico Used in Plug and Play System Monitor | Tom's Hardware

    Dmytro Panin is at it again, creating a teeny system monitor for his MacBook from scratch with help from our favorite microcontroller, the Raspberry Pi Pico. This plug-and-play system monitor (opens in new tab) lets him keep a close eye on resource usage without having to close any windows or launch any third-party programs. The device is Pico-powered and plugs right into the MacBook to function. It has a display screen that showcases a custom GUI featuring four bar graphs that update in real-time to show the performance of different components, including the CPU, GPU, memory, and SSD usage. It makes it possible to see how hard your PC is running at a glance.

Security Leftovers

How to Apply Accent Colour in Ubuntu Desktop

A step-by-step tutorial on how to apply accent colour in Ubuntu desktop (GNOME) with tips for Kubuntu and others. Read more