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today's howtos

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HowTos
  • How to Create Abstract Desktop Backgrounds with Trianglify Wallpaper - Make Tech Easier

    Many people prefer using abstract desktop backgrounds as their desktop wallpaper since they allow you to stay focused on what matters: the foreground apps. It’s boring staying with the same wallpaper for months, but it also feels like wasting your time hunting down new abstract wallpaper. Why not try out Trianglify Wallpaper, an easy-to-use app that can make your desktop more exciting and somewhat dynamic?

    With Trianglify Wallpaper, you can manually create abstract desktop backgrounds based on triangular shapes and add color to your desktop. You can also set it on auto and let it loose to create and place new wallpaper on your desktop automatically. Let’s see how.

  • RHCE Ansible Series #10: RHEL System Roles
  • Linux Command Basics: 7 commands for process management | Enable Sysadmin

    If you're new to Linux and need help managing your processes, these basic commands are for you.

  • Upgrade Fedora 33 from Fedora 32 using DNF – If Not True Then False

    This is guide, howto upgrade Fedora 32 to Fedora 33 using DNF. This method works on desktop and server machines. You can also upgrade older Fedora installations (example Fedora 31/30/29) directly to Fedora 33.

    I have tested this method on several machines, but if you have problems, please let me know. Always remember backup, before upgrade!

  • How do i install MongoDB on CentOS / RHEL - LinuxTechLab

    It has been created keeping the current database requirement in mind for modern applications & the cloud era. MongoDB is very fast & has great performance when compared to the SQL database. MongoDB databases are very easy to scale & they also address various shortcomings that other SQL databases present.

  • Quickly Navigate Through Directory History In Fish Shell - OSTechNix

    Do you often work with large number of directories? I have a small tip for you. This brief guide explains how to quickly navigate through directory history using cdh, nextd and prevd commands in Fish shell in Linux.

    [...]

    A while ago, we discussed about pushd, popd and dirs commands which allows us to quickly navigate through a stack of directories. Unlike the normal cd command, the pushd, popd and dirs commands helps you to easily move back and forth between directories, without having to type the full path. These trio commands comes in handy when you are working with large number of directories and sub-directories. Today, we will learn three other similar commands namely cdh, nextd and prevd.

    As the name says, the cdh command allows you to change to the recently visited directories, the nextd command allows you to move forward through directory and the prevd command allows you to move backward through directory history.

    This set of three commands are available only in Fish shell and they are often used to navigate through the recently visited directories easily as well as quickly.

    The cdh, nextd and prevd commands are quite useful if you are often dealing with deep directory structure. You can quickly go forward or backward without having to the type the actual path of the directories. These triplet makes your CLI navigation better and faster!

  • How to Install and Setup Let’s Encrypt (Certbot) on Linux

    Getting an HTTPS certificate for your website is not anymore an optional choice. If you are a website developer, you might know that Google has already declared that those who have an SSL certificate into their website will get privileges to rank their website in the google search engine rank. Moreover, getting an SSL certificate makes your website secure, invulnerable, and trustworthy to the visitors. Now, there are many certification authorities to give your website an SSL certificate; the confusion is, which one should you use? While speaking of the SSL certificate, Let’s Encrypt is the most popular and free certification authority to grant your website an SSL certificate and make it secure. You can install and run the Let’s Encrypt on Linux and any other platforms.

  • How To Install Node Version Manager Tool - NVM on Linux System

    NVM is a cross-platform node version manager that can maintain a different version of nodes on your Linux system. Now, if you are familiar with working with Node.js, you might already know that there are plenty of versions of Node.js are available. NVM works with the help of the source-code of NodeJS and the Chrome V8 engine. The engineers of Google build the chrome V8 engine, and they made a collaboration with the NVM to offer the users a smooth and reliable user interface. You can install this tool on your Linux distribution to reduce the memory issue, to upgrade the Node.js file automatically on your system.

  • Free up Disk Space – Clear Systemd Journal Logs in Ubuntu 20.04 | UbuntuHandbook

    Going to free up Ubuntu system disk space? Try clearing the systemd journal logs, it may free up a few GB of space.

    By using the Disk Usage Analyzer tool, I found that /var/log/journal takes more than 4 GB system space in my Ubuntu 20.04.

  • Set up OpenStack on a Raspberry Pi cluster | Opensource.com

    In the year since the Raspberry Pi 4 was released, I've seen many tutorials (like this and this) and articles on how well the 4GB model works with container platforms such as Kubernetes (K8s), Lightweight Kubernetes (K3s), and Docker Swarm. As I was doing research, I read that Arm processors are "first-class citizens" in OpenStack. Since Raspberry Pi is built on Arm, I decided to test this theory by installing OpenStack on a Raspberry Pi cluster.

  • Vagrant beyond the basics - Fedora Magazine

    There are, like most things in the Unix/Linux world, many ways of doing things with Vagrant, but here are some examples of ways to grow your Vagrantfile portfolio and increase your knowledge and use.

    If you have not yet installed vagrant you can follow the first part of this series.

  • Verifying Linux Server Security: What Every Admin Needs to Know

    Linux is a widespread OS known for its robust security. That being said, vulnerabilities are inevitable in any OS, and Linux system administrators must be vigilant about monitoring and verifying the security of their servers on an ongoing basis in order to protect sensitive data and prevent attacks. After all, the majority of attacks on Linux systems can be attributed to poor administration.

  • Swap mouse buttons via key shortcut in Gnome - Lukáš Zapletal

    Gnome provides an easy way to swap mouse buttons which is a useful feature for left-handed people. I am right-handed, however I am trying to swap mouse in my hands to compensate and prevent injury. Swapping buttons via Mouse and Touchpad settings is slow and clunky.

    You will find many tutorials on how to swap buttons from the command line but these are XOrg or xinput remappings. I wanted to do it consistently so Gnome is not confused and also the Mouse and Touchpad dialog or other applications work properly.

  • Parsing sudo JSON logs: building a syslog-ng configuration - Blog - syslog-ng Community - syslog-ng Community

    The latest version of sudo, version 1.9.4 includes support for JSON formatted logging. Compared to traditional sudo logs, it has the advantage of containing more information in a structured way. While traditional sudo logs are also parsed automatically by syslog-ng, it is worth taking a look at the new JSON formatted logs.

    From this blog, you can learn how the new logs look like and also a configuration working with these logs. Instead of just posting a complex configuration, I try to show you how my configuration was built. Creating a new configuration in smaller iterations makes the resulting configurations easier to debug.

  • The 50 Most Useful Zypper Commands for SUSE Linux Users

    If you are a veteran Linux user like me, chances are you have come across the term SUSE Linux. It is one of the most powerful, enterprise-ready Linux distribution and is used by a plethora of companies worldwide. In fact, SUSE was the first Linux distribution marketed for businesses. SUSE has two variants – a free, open-source version called openSUSE and a commercial solution named SUSE Linux Enterprise. The zypper command-line utility is the de-facto package management solution for both of these variants. In this guide, we will provide some practical instructions on how to use this tool.

More in Tux Machines

Chafa 1.6.0: Wider

Here’s another one from the terminal graphics extravaganza dept: Chafa 1.6.0 brings fullwidth character support, so in addition to the usual block elements and ASCII art, you now get some mean CJK art too. Or grab as many fonts as you can and combine all of the Unicode into one big glorious mess. Chafa can efficiently distinguish between thousands of symbols, so it also runs fast enough for animations — up to a point. Since some users want this in environments where it’s not practical to build from source or even to have nice things like GLib, I’ve started adding statically linked builds. These are pretty bare-bones (fewer image loaders, no man page), so look to your steadfast distribution first. Speaking of distributions, a big thank you to the packagers. Special thanks go to Florian Viehweger for getting in touch re. adding it to OpenBSD ports, and Mo Zhou (Debian), Michael Vetter (openSUSE), Herby Gillot (MacPorts), @chenrui and Carlo Cabrera (Homebrew) for getting 1.6 out there before I could even finish this post. Read more

ClusBerry 9500-CM4 – A Raspberry Pi CM4 cluster, industrial style

Raspberry Pi cluster boards / solutions pop-up from time to time. But so far, I think we’ve seen only one based on Raspberry Pi CM4 modules with the upcoming Turing Pi 2 mini-ITX cluster board supporting four of those. TECHBASE has now unveiled a different kind of Raspberry Pi CM4 cluster with ClusBerry 9500-CM4 integrating up to eight Raspberry Pi Computer Module 4 in a DIN-Rail housing for industrial applications. Read more

Rotary Un-Smartphone is a rotary dial phone based on Arduino, 4G LTE module

If you feel nostalgic and misses the days of the rotary dial phone, Sky’s Edge “Rotary Un-Smartphone” is an open-source hardware rotary dial phone controlled by an Arduino board and equipped with a multi-mode 4G/3G/2G module. It’s a bit more advanced that you old rotary phone with recent cellular technology, ePaper & OLED displays, quick dialing buttons, and the rotary dial can both be used to dial full phone number or quickly access your contact list. Read more Also: 42Gears SureMDM Simplifies Setting up Kiosk Mode on Linux Devices

today's howtos

  • How to kill all user sessions on Linux using shell script

    There are multiple ways to automate the system administrator task on Linux. It drastically reduces human efforts and saves reasonable time. shell script is one of the methods to automate frequent jobs. For a scenario, you want to run a weekly job or EOD job to populate some data for reporting purposes. To do so, you need to kill all ssh sessions that are currently accessing the application on the system before beginning the job.

  • How to install GSnap in Audacity on a Chromebook - VST Plugins

    Today we are looking at how to install GSnap, a free VST plugin, in Audacity on a Chromebook. Please follow the video/audio guide as a tutorial where we explain the process step by step and use the commands below. If you have any questions, please contact us via a YouTube comment and we would be happy to assist you!

  • How to Install GitLab on Debian 10 (Buster)

    GitLab is a free and opensource front-end Git repository that features a Wiki and an issue tracking feature. It allows you to host Git repositories on your own server and setup DevOps platform. In this guide, we are going to install GitLab CE (Community Edition) on Debian 10 (Buster) system.

  • Unix Tutorial - Annual Digest - 2020

    Wow, 2020 just flew by! With one lockdown after another, most of the year was spent working from home and checking local government websites for guidance around when schools and after-schools would re-open. I didn’t blog as much as I hoped but stayed sane and otherwise productive - so can’t complain much about 2020.