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today's howtos

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HowTos

  • How to install Lubuntu 21.04

    In this video, I am going to show how to install Lubuntu 21.04.

  • How to Install Pleroma Social Network Platform on Ubuntu 20.04

    Pleroma is an open-source federated social networking platform, compatible with Mastodon and other ActivityPub platforms. It is a part of the Fediverse, a federated network of instances that can communicate using a common protocol. One single account on one instance can talk to the entire Fediverse network.

    This guide will show you how to create your own Pleroma instance by installing it on an Ubuntu 20.04 based server.

  • What is Cert-Manager and how to setup Cert-Manager for SSL certificates in Kubernetes Cluster on AWS using Helm

    Cert-Manager is a controller used for certificate management. A Cert-Manager can help to issue certificates from different issuers like Let’s Encrypt, HashiCorp Vault, Venafi, a simple signing key pair, or self-signed. Cert-Manager validates certificates, ensures they are up to date, and renews before expiry. Cert-Manager is made up of several components as mentioned below.

  • How to prevent CUPS omitting the bottom of the CUPS Printer test page | Fitzcarraldo's Blog

    This is something that has been bugging me for years but I never bothered to look into it until now. When I set up a printer using CUPS Administration and then print a test page, for some printers the bottom of the test page image is cut off, as shown in the scanned image below. Also, the left side of the test page image is too close to the left side of the sheet of paper. This happens when I use the Gutenprint printer drivers, although I do not know if that is a coincidence. The CUPS printer test page (A4 paper) shown below is from a Canon PIXMA MP510 printer using the Gutenprint v5.3.3 driver for that model.

  • How to install GNOME (GUI) on CentOS - LinuxTechLab

    When we install any CentOS version, we do have the option to install GUI along with the operating system as well. But many times, we might not install the GUI as we do not have a need for the GUI & installing those packages for GUI will only result in an increase in CentOS installation size.

    But what do we do if need to GUI for CentOS afterward? Do we need to reinstall CentOS ? or can we just install some packages for GUI?

    The answer to that is, Yes we can install GNOME (GUI) on CentOS. In this tutorial, we will learn how to install Gnome of CentOS 7 installations. Gnome provides a nice GUI for us to manage our servers graphically.

  • MongoDB Replica Set with Master-Slave Replication and Automated Failover

    A replica set is a group of MongoDB database nodes used for defining database clusters with master-slave replication and automated failover. A replica set contains a single primary node, multiple secondary nodes, and an arbiter node. The primary node receives all write operations while other nodes apply operations from the primary so that all nodes have the same data set.

    If your primary node breaks due to hardware failure or system-related issues, the replica set members autonomously select a new primary node, and your application functioning without manual intervention.

    In this post, we will explain how to set up a MongoDB replica set with three nodes. We will also show you how to create an environment, configure authentication between multiple database nodes and finally configure the replication between all nodes.

  • Write a bash/shell script to Finding and deleting duplicate files or directories - Linux Concept

    At one point, we had already talked about checking to see if strings inside of a file were unique and if we could sort them, but we haven’t yet performed a similar operation on files. However, before diving in, let’s make some assumptions about what constitutes a duplicate file for the purpose of this recipe: a duplicate file is one that may have a different name, but the same contents as another.

  • WordPress News – Getting Started with the Figma WordPress Design Library – WordPress.org

    As the name suggests, the WordPress Design Library is a library of WordPress design assets, enabling anyone to quickly create design prototypes for WordPress UI in Figma.

    These tools are useful for designers when creating new UI and for anyone looking to contribute ideas, enhancements, or even solutions to bug reports. Sometimes pictures really do speak a thousand words.

    In this post, we’ll talk about some key features of Figma before diving into a practical example that demonstrates some of the WordPress Design Library utilities.

  • How-to Get [Query] AWS EC2 Instance Metadata

    In this tutorial we will learn how to get EC2 Instance Metadata from an AWS EC2 instance. We will get the metadata using ec2-metadata and ec2 metadata. This is not typo. The tools name is really similar but one of them using dash on its name.

  • IUS Repository On CentOS 7 : How To Enable

    In this tutorial we’ll learn how to enable IUS repository on CentOS 7. IUS stands for Inline with Upstream Stable.

    IUS will update RPM packages once new versions released by upstream developers. IUS will also not replace stock RPM packages or pacakges that shipped with distribution. The goal of IUS project is to provide high quality RPM packages for Red Hat Enterprise Linux (RHEL) and CentOS.

  • How to Discover, From Inside a Bash Script, the Path the Script Is In

    When you develop complex Bash scripts and start putting various scripts into a folder, where one script interacts with another by, for example, starting it, it quickly becomes necessary to ensure we know the path the script was started from, so we can start the other scripts with a fully qualified pathname. This is important because the first script may have been started from outside the script’s directory. We could have also done so by using a relative path, so even - somehow - reading the command that started the current script will not work.

  • How To Install Linux Kernel 5.12 In Ubuntu / Linux Mint | Tips On UNIX

    Linus Torvalds announced the Linux Kernel 5.12 after few weeks in development and available for general usage with new features, improvements, and better hardware support.

    As per Linus Torvalds for Kernel 5.12

    Thanks to everybody who made last week very calm indeed, which just makes me feel much happier about the final 5.12 release.

    This tutorial will be helpful for beginners to install kernel 5.12 in Ubuntu 20.04 LTS, Ubuntu 20.10, Ubuntu 18.04 LTS, and LinuxMint 20.1

  • How to Upgrade to Fedora 34 from Fedora 33 - Fedora Version Update - Putorius

    Now that Fedora 34 is released with all of it’s new goodies we will show you how to upgrade your system. This guide will show you how to upgrade your Fedora 33 (or earlier) system to the latest and greatest. We will be upgrading Fedora using the DNF package manager. Let’s get started.

  • How to install Netdata on Linux such as Ubuntu 20.04 Server to monitor - Linux Shout

    Netdata is a free web-based real-time monitoring solution available to install on Linux servers to monitor their performance and resource consumption locally or remotely. It is very easy to set up, the latest version can be installed with just a command on all popular Linux systems including Ubuntu 20.04/18.04, CentOS 7/8, RHEL, OpenSUSE, Debian, Linux Mint and more…

  • How To Set A Cron Job In TrueNAS (the easy way)

    In this article we are going to create a new cron job in TrueNAS using the web interface.

    What is a “Cron Job”? It’s a time-based job scheduler in Unix-like computer operating systems. Users who set up and maintain software environments use cron to schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or intervals.

    So to create our first job we need to open the web panel go to your TruNAS IP address for example 192.168.0.7 and you will see the login dashboard (after you login...

More in Tux Machines

C/C++ Programming/Development

  • How to pass a struct to a function in C

    A structure has been widely used as a user-defined data type in the C language. The purpose of using structures in C is to create a single data type that would be used further to group various data type variables or elements into one type. The structure has been used as a global variable so all the functions can access it easily. This means it can’t be declared in the main method so that we can use it anywhere.

  • C++ String Reverse

    If the string, “vwxyz“, is reproduced in the new order as, “zyxwv“. Then the string has been reversed. Unfortunately, such direct reversibility is not possible in C++. However, there is a classical workaround for reversing a string in C++. Keep reading this article to know-how. A string can be created in two main ways in C++. A string can be created as a constant pointer to a sequence of characters. A string can also be created by instantiating a string object from the string class. This article deals with string objects instantiated from the string class. This means the string library has to be included in order to execute the code samples in this article. A string object is a data structure where the string literal is a list. Each character is of one element in the list. And so, a literal string can be handled like an array of elements. This article explains the classical workaround to reverse a string in C++. This essentially iterates the string literal, backward. Having a summary knowledge of forward iteration enables the reader to understand reverse iteration better. This article deals with string objects instantiated from the string class.

  • C++ String starts with

    There comes a time when the programmer has to know what a string starts with. This knowledge can be used to choose or eliminate items in a list of characters. So, a programmer may want to know if a string starts with a particular character or with a particular sub-string. A programmer can write code that will check the initial characters of a string, one-by-one, and compare that with a prefix sub-string. However, all the strategies involved have already been done by the C++ string library. The C++ string class of the string library has the member function, starts_with(). This does the work for the programmer, but the programmer needs to know how to use the function. And that is why this tutorial is being produced. There are three variants of the string starts_with() member function. Variants of the same function are called overloaded functions. The basic approach for the start_with() member function is to compare a short independent sub-string with the first short segment of the string in question. If they are the same, then the function returns true. If they are different, the function returns false.

  • Function Overloading in C

    Function overloading is a very well-known concept used in object-oriented languages having many functions with the same name and different parameters in a single code. The object-oriented programming languages which support function overloading include Java and C++. As the C compiler doesn’t allow it to be used in the code hence, it isn’t easy to implement function overloading in C. Yet; we can still achieve the same thing with some technique. Let’s start this article with the opening of the shell terminal of Ubuntu 20.04 LTS.

PineTime Smartwatch and Good Code Play Bad Apple

PineTime is the open smartwatch from our friends at Pine64. [TT-392] wanted to prove the hardware can play a full-motion music video, and they are correct, to a point. When you watch the video below, you should notice the monochromatic animation maintaining a healthy framerate, and there lies all the hard work. Without any modifications, video would top out at approximately eight frames per second. To convert an MP4, you need to break it down into images, which will strip out the sound. Next, you load them into the Linux-only video processor, which looks for clusters of pixels that need changing and ignores the static ones. Relevant pixel selection takes some of the load off the data running to the display and boosts the fps since you don’t waste time reminding it that a block of black pixels should stay the way they are. Lastly, the process will compress everything to fit it into the watch’s onboard memory. Even though it is a few minutes of black and white pictures, compiling can take a couple of hours. Read more

today's howtos

  • How to play Dungeon Defenders on Linux

    Dungeon Defenders is a hybrid multiplayer video game developed by Trendy Entertainment. The game was released on Microsoft Windows, Xbox, iOS, Mac OS, Linux, etc. Here’s how to play the game on Linux.

  • How to play Company of Heroes on Linux

    Company of Heroes is a real-time strategy game developed by Relic Entertainment. The game takes place during WWII and was released on Windows, OS X, iOS, Android, and Linux. Here’s how you can play Company of Heroes on your Linux PC.

  • How to Install TeamViewer on Ubuntu Linux

    TeamViewer is a popular cross-platform tool that allows a user to remotely access and control another user’s computer in an easy and secure way. File sharing, remote desktop control and web conferencing between computers are all possible using TeamViewer. TeamViewer is useful for providing remote customer support in organizations, collaborating with colleagues who are far away, and connecting to your own device remotely. This article will walk you through the process of installing TeamViewer on Ubuntu systems.

  • How to Upgrade Ubuntu 21.04 to 21.10 Impish Indri

    Ubuntu has officially released the Ubuntu 21.10 codenamed Impish Indri. This has seen the introduction of GNOME 40 as the default desktop, and sadly GNOME 41 did not make the final cut. The release also introduces Linux Kernel 5.13 among new applications and other back-end performance improvements.

  • How to Extract Tar Bz2 File in Linux - ByteXD

    In this tutorial, we will be showing you how to use tar command to extract tar.bz2 files. Tar stands for tape archive, and it is one of the most used commands that deals with compressed archive files. Bz2 stands for bzip2. It is a specific compression algorithm. The tar command comes pre-installed in most Linux distributions. The tar utility is used to compress and extract files using different algorithms. Tar supports a wide array of compression algorithms such as gzip, bzip2, xz, lzip, etc.

  • How to mount ISO in Kubuntu Linux - Darryl Dias

    Dolphin file manager in Kubuntu (Tested this in Kubuntu 21.04) does not ship with Mount ISO option in the right click menu, but with the help of the dolphin-plugins package we can add this and many other features.

  • Setup OpenWRT on BPi-R2 | Zamir's Board

    It’s pretty easy to get OpenWRT start and running on BPi-R2. However, I realized that I need to extend the root filesystem to the whole disk, which is where the struggling starts.

GNOME Gingerblue 2.0.0 Recording Software supports XSPF 1.0

GNOME Gingerblue 2.0.0 is Free Recording Software for GNOME. In the 2.0.0 release I have added support for XSPF 1.0 from Xiph.org. Read more Also: Free Software Review: Balena Etcher couldn’t be easier for writing ISO images, but do they really need telemetry? – BaronHK's Rants