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A friendly guide to the syntax of C++ method pointers

Monday 22nd of February 2021 08:01:00 AM

If you're looking for performance, complexity, or many possible solutions to solve a problem, C ++ is always a good candidate when it comes to extremes. Of course, functionality usually comes with complexity, but some C++ peculiarities are almost illegible. From my point of view, C++ method pointers may be the most complex expressions I've ever come across, but I'll start with something simpler.


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A step-by-step guide to Knative eventing

Monday 22nd of February 2021 08:00:00 AM

In a previous article, I covered how to create a small app with Knative, which is an open source project that adds components to Kubernetes for deploying, running, and managing serverless, cloud-native applications. In this article, I'll explain Knative eventing, a way to create, send, and verify events in your cloud-native environment.


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5 benefits of choosing Linux

Monday 22nd of February 2021 08:00:00 AM

In 2021, there are more reasons why people love Linux than ever before. In this series, I'll share 21 different reasons to use Linux. This article discusses the benefit of choice Linux brings. 


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Run your favorite Windows applications on Linux

Sunday 21st of February 2021 04:10:00 PM

In 2021, there are more reasons why people love Linux than ever before. In this series, I'll share 21 different reasons to use Linux. Here's how running Windows apps on Linux can be made seamless with WINE.

Do you have an application that only runs on Windows? Is that one application the one and only thing holding you back from switching to Linux? If so, you'll be happy to know about WINE, an open source project that has all but reinvented key Windows libraries so that applications compiled for Windows can run on Linux.


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Unlock your Chromebook's hidden potential with Linux

Friday 19th of February 2021 08:02:00 AM

Google Chromebooks run on Linux, but normally the Linux they run isn't particularly accessible to the user. Linux is used as a backend technology for an environment based on the open source Chromium OS, which Google then transforms into Chrome OS. The interface most users experience is a desktop that can run Chrome browser apps and the Chrome browser itself. And yet underneath all that, there's Linux to be found.


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Why every job in the tech industry is technical

Friday 19th of February 2021 08:01:00 AM

Several years ago, I applied for a marketing job at a tech company. I got called back for the phone screening and had a delightful conversation with the recruiter. The next day, I got an email from the recruiter saying that I was not “technical” enough to move forward to the next round of interviews. I was shocked. 


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My open source internship during a pandemic

Friday 19th of February 2021 08:00:00 AM

In May 2020, in the early months of the coronavirus pandemic, I started a summer internship with Red Hat. COVID-19 had cut short my third year studying computer engineering at Georgia Tech, and I learned I would have to work remotely all summer. I wasn't sure what to expect from a virtual internship.


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5 must-have Linux media players

Thursday 18th of February 2021 08:02:00 AM

In 2021, there are more reasons why people love Linux than ever before. In this series, I'll share 21 different reasons to use Linux. Playing media is one of my favorite reasons to use Linux.


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3 agile podcasts to add to your queue

Thursday 18th of February 2021 08:01:00 AM

Agile's growing popularity over the last 20 or so years causes some organizations to get it wrong—they apply a bandage when full-blown sustainable solutions are required. But many companies are getting it right with patience, commitment, collaboration, and amazingly intelligent and creative agile leaders and experts to guide them. Many of these experts are sharing their knowledge through podcasts, allowing anyone to learn from their experience.


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Not an engineer? Find out where you belong

Thursday 18th of February 2021 08:00:00 AM

In the first article in this series, I explained the problems with dividing people and roles into "technical" or "non-technical" categories. In the second article, I shared some of the tech roles for people who don't code. Here, I'll wrap up this exploration into what it means to be technical or non-technical with some recommendations to help you on your journey.


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5 reasons to use Linux package managers

Wednesday 17th of February 2021 12:51:00 PM

In 2021, there are more reasons why people love Linux than ever before. In this series, I'll share 21 different reasons to use Linux. Today, I'll talk about software repositories


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Use this bootable USB drive on Linux to rescue Windows users

Wednesday 17th of February 2021 08:01:00 AM

People regularly ask me to help them rescue Windows computers that have become locked or damaged. Sometimes, I can use a Linux USB boot drive to mount Windows partitions and then transfer and back up files from the damaged systems.


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4 tech jobs for people who don't code

Wednesday 17th of February 2021 08:00:00 AM

In the first article in this series, I explained how the tech industry divides people and roles into "technical" or "non-technical" categories and the problems associated with this. The tech industry makes it difficult for people interested in tech—but not coding—to figure out where they fit in and what they can do.


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How to install Linux in 3 steps

Tuesday 16th of February 2021 08:02:00 AM

In 2021, there are more reasons why people love Linux than ever before. In this series, I'll share 21 different reasons to use Linux. Here's how to install Linux. 


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How Ansible got started and grew

Tuesday 16th of February 2021 08:02:00 AM

Recently, Flagsmith founder Ben Rometsch spoke to Michael DeHaan, founder of open source IT automation software Ansible (now part of IBM/Red Hat), on The Craft of Open Source podcast about how he developed Ansible and what he's been doing since.


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What does being 'technical' mean?

Tuesday 16th of February 2021 08:00:00 AM

The word "technical" describes many subjects and disciplines: technical knock-out, technical foul, technical courses for rock-climbing competitions, and technical scores for figure skating in sports. The popular cooking show The Great British Bake-Off includes a technical baking challenge. Anybody who has participated in the theatre may be familiar with technical week, the week before the opening night of play or musical.


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Why everyone should try using Linux

Monday 15th of February 2021 08:02:00 AM

In 2021, there are more reasons why people love Linux than ever before. In this series, I'll share 21 different reasons to use Linux. Let's explore why anyone can try Linux.


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Protect your Home Assistant with these backups

Monday 15th of February 2021 08:01:00 AM

In the last two articles in this series on home automation with Home Assistant (HA), I walked through setting up a few integrations with a Zigbee Bridge and some custom ESP8266 devices that I use for automation.


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A practical guide to JavaScript closures

Monday 15th of February 2021 08:00:00 AM

In 4 reasons why JavaScript is so popular, I touched on a few advanced JavaScript concepts. In this article, I will dive into one of them: closures.


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Give something from the heart to the public domain

Sunday 14th of February 2021 08:01:00 AM

Did you know that most of the articles published on Opensource.com are licensed under Creative Commons BY-SA 4.0?

One of the biggest reasons our editorial team decided on this license over 10 years ago is because we support the idea that the best content is shared content. As we strive to be open, our goal is for any many people as possible to have access to the information we're putting out there to support our mission to help others learn and grow and to explore new open source worlds.


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More in Tux Machines

Free Software Leftovers

  • From Clean & Green Mockup to OpenBSD cwm(1) desktop

    If the words CGA or Hercules raise sweet memories from your far away youth, the Mockup Clean & Green from u/awareofdistractions may hit you right in the heart. And if you like it so much, it may be used for real-life desktop environment using OpenBSD stock and ports material.

  • Learning more about our users

    At the Tor Project we practice user-centered design. This means we put our users at the heart of our development process, making a conscious effort to understand the contexts in which people use our tools and paying particular attention to the bumps they encounter along the way.

    Many digital product companies rely heavily on data gathered from invasive tracking scripts to better understand their users’ behavior, further fueling the surveillance economy. However that’s not how we do things at Tor – instead, we aim to conduct research that respects the basic principles of privacy and consent.

  • New Release: Tor Browser 10.5a11

    Tor Browser 10.5a11 is now available from the Tor Browser Alpha download page and also from our distribution directory.

    Note: This is an alpha release, an experimental version for users who want to help us test new features. For everyone else, we recommend downloading the latest stable release instead.

  • FSFE20 +++ IloveFS +++ Job vacancy

    In our February Newsletter, we interview our founding president Georg Greve as part of our publication series to celebrate 20 Years FSFE, we reflect on I love Free Software Day and our FOSDEM participation, we advertise our new job vacancy and as usual we report on our diverse community activities.

  • Keeping platforms open

    My previous article, Whatsapp and the domestication of users, got more attention than I was expecting. Some responses gave me a lot to think about,1 especially regarding actions we can take. I suggest reading that article first; it explained what “user domestication” is and why it’s a problem. It enumerated three countermeasures: FOSS, simplicity, and open platforms.

    Hard problems, by definition, lack easy solutions. Simply choosing (or creating) a platform that avoids user domestication isn’t enough if that platform can change. The price of freedom is eternal vigilance; in addition to settling on the right platform, we must ensure that it honors its users in both the present and the future. Keeping a platform FOSS and simple is more straightforward2 than keeping a platform “open”.

    How do we keep an open platform from becoming a closed platform in the future?

Programming Leftovers

  • 6 Top Data Analysis Tools for Big Data

    Big Data is an all-inclusive term that refers to data sets so large and complex that they need to be processed by specially designed hardware and software tools. The data sets are typically of the order of tera or exabytes in size. These data sets are created from a diverse range of sources: sensors that gather climate information, publicly available information such as magazines, newspapers, articles. Other examples where big data is generated include purchase transaction records, web logs, medical records, military surveillance, video and image archives, and large-scale e-commerce. There is a heightened interest in Big Data and Big Data analysis and the implications they have for businesses. Big Data analysis is the process of examining huge quantities of data to find patterns, correlations, and other useful information that can help firms become more responsive to change, and to make better informed decisions. Big Data analysis can be performed with data mining software. However, the unstructured data sources used for big data analysis are not necessarily suitable for investigation by traditional data mining software.

  • 50 Years of Pascal

    Pascal was easy to teach, and it covered a wide spectrum of applications, which was a significant advantage over Algol, Fortran, and Cobol. The Pascal System was efficient, compact, and easy to use. The language was strongly influenced by the new discipline of structured programming, advocated primarily by E.W. Dijkstra to avert the threatening software crisis (1968).

  • How to use Django Serializers – Linux Hint

    Serializer is used in Django to convert the model instances or querysets into python supported data types that can be easily rendered into JSON, XML, or other formats. The deserialization can also be done by serializers to get back the original data from the serialized data. This feature is available in Django REST Framework. So, the users have to install this framework to use the serializers. Any webpage of the website may contain HTML, CSS, and data from the database tables. But the API does not understand these types of content, and it can understand the raw data only, that is, JSON data. How the serializers can be used to convert the model instance into JSON format has shown in this tutorial.

  • How to use queryset in django – Linux Hint

    Most of the web applications are implemented with the database now. queryset is used in the Django application to retrieve records by filtering or slicing or ordering the database table without changing the original data. The model used Django to create the table in the database. So, the knowledge of using the model in Django is necessary to understand the use of queryset. The main function of the queryset is to iterate the records of database tables by converting them into SQL queries. It can be used from the python command line or by writing the python script to display the browser’s output. The uses of queryset for retrieving data from a database table in different ways have been explained in this tutorial.

  • This Week In Rust: This Week in Rust 379 [Ed: The usual paradox of developing "openly" while requiring people to get an account with Microsoft and then use proprietary software of Microsoft, which attacks Free software.]

    This Week in Rust is openly developed on GitHub.

  • What Is BC in a Bash Script? – Linux Hint

    BC, which stands for Basic Calculator, is a command in Bash that is used to provide the functionality of a scientific calculator within a Bash script. This can be useful for scripting with various arithmentic use cases and scenarios. This article shows you how to use BC in a Bash script.

Security Leftovers

  • How often should I rotate my ssh keys?

    My story for today is about ssh and how even public keys, while much better than simple passwords, are still not a perfect solution.

    The danger is credential theft, which is a fancy way of saying “someone stole your private keys.” Back in the 1990s, that problem was pretty far from our minds; Windows 98 didn’t even have the concept of a separate administrator account, never mind the idea of app sandboxing or the inkling that someone might intentionally want to load malware onto your computer and encrypt all your files for ransomware. Those were the days when some people thought ActiveX controls (essentially loading .exe files from web sites) might be a good idea. Actually, maybe even a great idea as long as there was an “are you sure?” dialog box first.

  • 4 of the Best LastPass Alternatives

    LastPass has recently changed its free account usage policy to be only available on one device, and a lot of its users are not happy about it. If you are a LastPass Free user and are looking to switch, here are four great LastPass alternatives you should check out. These services reserve their pricing tiers for more advanced, business-oriented users while still leaving free users with a powerful set of features to safeguard their online accounts data.

  • Security updates for Thursday

    Security updates have been issued by Arch Linux (ansible-base, keycloak, mumble, and postgresql), Debian (firefox-esr and nodejs), Fedora (dotnet3.1, dotnet5.0, keylime, php-horde-Horde-Text-Filter, radare2, scap-security-guide, and wireshark), openSUSE (postgresql, postgresql13 and python-djangorestframework), Red Hat (Ansible, firefox, and thunderbird), Scientific Linux (firefox and thunderbird), SUSE (php7, postgresql-jdbc, python-cryptography, rpmlint, and webkit2gtk3), and Ubuntu (dnsmasq, linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon, linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi, linux, linux-aws, linux-kvm, linux-lts-xenial, linux-raspi2, linux-snapdragon, linux-oem-5.10, linux-oem-5.6, screen, and xterm).

  • Biden signs executive order calling for semiconductor supply chain review

    President Biden signed an executive order Wednesday addressing growing concern over a global semiconductor shortage hampering the production of goods like automobiles and smartphones.

    The White House’s executive order directs the federal government to conduct 100-day reviews of supply chains in four sets of products, including computer chips and large capacity batteries, like those used in electric vehicles, according to administration officials.

  • Biden Orders Review to Shore Up Supply Chain Resiliency

    On top of the 100-day review of the four key industries, Biden’s order will also direct yearlong reviews for six sectors: defense, public health, information technology, transportation, energy and food production.

    Biden said his administration will implement the recommendations as soon as they are available. “We're not going to wait for the review to be completed before we start closing the existing gaps,” he said.

  • Technology Executives Say All Evidence Points To Russia In Major Hack Of Computer Networks

    Smith told the committee that the true scope of the intrusions is still unknown because most victims are not legally required to disclose attacks unless they involve sensitive information about individuals.

  • Finnish IT Giant Hit with Ransomware Cyberattack [iophk: Windows TO]

    Norwegian business journal E24 reported the attack on Espoo, Finland-based TietoEVRY on Tuesday, claiming to have spoken with Geir Remman, a communications director at the company. Remman acknowledged technical problems with several services that TietoEVRY provides to 25 customers, which are “due to a ransom attack,” according to the report.

    Remman told E24 that the company considers the attack “a serious criminal act.” TietoEVRY turned off the unspecified services and infrastructure affected “as a preventative measure” until it can recover relevant data, and restart systems “in a controlled manner,” he said.

Ubuntu Leftovers

  • Ubuntu Aims For Higher Quality LTS Point Releases - Phoronix

    New restrictions will be in place beginning with Ubuntu 20.04.3 LTS this summer to try to enforce better quality releases with less regressions by enforcing better quality control. The change beginning with Ubuntu 20.04.3 LTS will require that stable release update (SRU) procedures are followed even for release blockers. This will require that every fix follows the same verification, regression analysis, and aging period process. The tighter quality controls will likely lead to slips in release targets if bugs are found in the release candidates for new point releases, as it will first need to go through the verification and aging process.

  • DFI Partners With Ubuntu For IoT Hardware, OTA Updates - Phoronix

    Most of you probably haven't heard of DFI much in nearly two decades since the days of their colorful "LanParty" motherboards that were well known at the time, but these days they are focused on the industrial computer industry and have now teamed up with Canonical to partake in the Ubuntu IoT Hardware Certification Partner Program. DFI is the first industrial computer vendor joining the Ubuntu IoT Hardware Certification Partner Program for Ubuntu-certified hardware focused on the Internet of Things and embracing over-the-air software updates.

  • What is MEC ? The telco edge.

    MEC, as ETSI defines it, stands for Multi-access Edge Computing and is sometimes referred to as Mobile edge computing. MEC is a solution that gives content providers and software developers cloud-computing capabilities which are close to the end users. This micro cloud deployed in the edge of mobile operators’ networks has ultra low latency and high bandwidth which enables new types of applications and business use cases. On top of that an application running on MEC can have real-time access to a subset of radio network information that can improve the overall experience.