This is a weekly blog about the Raspberry Pi 4 (“RPI4”), the latest product in the popular Raspberry Pi range of computers.

Given the multimedia strengths of the RPI4, I’ve spent a few weeks covering video streaming, then examining the viability of the RPI4 to play locally stored video, before turning to examining the RPI4 as a home theater. Continuing this theme, for this week’s blog I look at the RPI4 as a screencaster (i.e. screen recording).

In the field of open source video recording, my preferred application is OBS Studio. It’s a truly first class cross-platform application that’s excellent for both video recording and live streaming. Open source at its very best. Sadly, the software is not available in the Raspbian repositories. I did expend considerable effort trying to compile the software on the RPI4. While I got fairly close, I wasn’t able to successfully build the software. If you’ve got OBS Studio running on the RPI4, I’d love to hear from you.

RSS news feeds are an exceptionally handy way to keep up to date on various websites. In addition to Opensource.com, I follow the annual SysAdvent sysadmin tools feed, some of my favorite authors, and several webcomics. RSS readers allow me to "batch up" my reading, so I'm not spending every day on a bunch of different websites.

• Google Pixel 4 With Android R Stops By Geekbench

• WhatsApp is rolling out dark mode to beta users on Android

• WhatsApp Is Now The Second Non-Google Android App To Complete Five Billion Downloads On Play Store

• WhatsApp beta for Android gains Dark mode

• Top 10 Best Android Browsers – 2020

• 10 Best Security Apps for Android (Not Just Antivirus)

• As Android 10 arrives on the G8, is LG finally getting its software right?

• LG’s Android 10 update has a Desktop Mode interface

• Twitter advises Android users against installing crash-prone update

• Shock Android warning issued for these Google Play Store apps - but should you be worried?

• Millions of Android phones in India to get this ISRO technology

• Installing VMware Workstation Player on Ubuntu

• SED command usage in Linux with examples

• Sandboxing with Firejail

• How to Install a Kubernetes Cluster on CentOS 8

• How to approach router (and other) network incidents

• Linux tools: Getting the message out with dmesg

• Why not couple an Operator’s logic to a specific Kubernetes platform?

There are many reasons you might want to share your Linux configuration with other people. You might be looking for help troubleshooting a problem on your system, or maybe you're so proud of the environment you've created that you want to showcase it to fellow open source enthusiasts.

You could get some of that information with a cat /proc/cpuinfo or lscpu command at the Bash prompt. But if you want to share more details, such as your operating system, kernel, uptime, shell environment, screen resolution, etc., you have two great tools to choose: screenFetch and Neofetch.

I recently read a survey on StackOverflow that said more than 49% of developers use Node.js for their projects. This came as no surprise to me.

As an avid user of technology, I think it's safe to say that the introduction of Node.js led to a new era of software development. It is now one of the most preferred technologies for software development, right next to JavaScript.

• u2k20 Hackathon Report: Alexandr Nedvedicky on PF anchors work

  Looking back everything could have be done with simple one-liner diff, which was just good enough for my particular use case. But the diff itself would not bring much improvement to pf(4). It feels so good to see, how quite a few people helped me to put stuff in shape, which brings us one step closer towards perfect pf(4).

• u2k20 Hackathon Report: Tracey Emery on GotWeb

  Stefan Sperling and I started a discussion in November about a CGI program, which would work in httpd(8), use the Game of Trees library along with the kcgi library by Kristaps Dzonsons, to display repository information in a browser. I was getting frustrated with working on my own project and was looking for something else to hack on. So, I told Stefan that I'd take a crack at Gotweb.

• Why you should migrate everything from Linux to BSD

  A Linux distribution is a collection of tools written by different groups of people, often with conflicting interests and priorities, and because of this fragmented structure of the GNU/Linux operating system, the project as a whole is rapidly spinning out of control as it gets pushed around by commercial interests.

  Even the best GNU/Linux distributions, such as Debian GNU/Linux and Arch Linux, that are still driven by Open Source enthusiasts, are not immune to this problem because they still depend heavily on the fragmented tools.

  In my article The real motivation behind systemd I have previously written about how the primary reason for developing systemd is Red Hat's interests in embedded devices. Initially systemd was released as a new init system, but it has slowly grown into what Poettering describes as "a suite of software that provides fundamental building blocks for a Linux operating system." This is by design, not by coincidence.

• Why you should migrate everything from Linux to BSD - part 2

  It is correct that Netflix is one of the biggest commercial contributors to FreeBSD, but this has nothing to do with "hijacking" as in the Linux world. Netflix is contributing all the improvements they make on FreeBSD back to the project. All the performance enhancements they have made has been contributed back to FreeBSD. This is very beneficial for FreeBSD.

  But Netflix is in no way trying to influence the FreeBSD project or trying to "hijack" FreeBSD. They don't need to. The BSD license makes it possible for Netflix to do whatever they want with FreeBSD, and they could easily just use FreeBSD without contributing anything back. However, Netflix has decided to give something back to the project and the least they could do was to contribute the improvements they have made.

  With regard to the services that Netflix provides and their so-called DRM content that can only be played using their proprietary application, and other proprietary project based upon FreeBSD, then that has no influence on FreeBSD, and that has absolutely nothing to do with "hijacking". None of these projects are affecting FreeBSD.

  [...]

  With the recent forced adoption of DRM going into the Linux kernel, and Linus Torvalds several detached statements from reality, and his complete disregard for many of the important matters in the Linux world, where he clearly doesn't care about how the companies are affecting the development (lots of bloatware), the future of the Linux kernel doesn't look bright, not from a privacy perspective and not from a security perspective.

What I failed to realize back then was that FreeBSD was (and it still is) designed as a complete multi-purpose operating system meant to be setup and tuned according to specific use cases. When I occasionally installed FreeBSD it didn't always perform as well as a default Debian GNU/Linux installation for the same task. Even FreeBSD on my FTP server at home eventually got replaced by Debian GNU/Linux because FreeBSD had to be rebooted every third day or so otherwise the performance degraded a lot. Debian on the other hand performed without any "hick-ups".

Later in the years to come GNU/Linux also got better hardware support, and often when I wanted to install FreeBSD some stupid hardware didn't work. Hardware was very expensive back then and I didn't have the option to purchase hardware that I knew would work on FreeBSD. All of these issues eventually made me use GNU/Linux more than FreeBSD. Today this is no longer a problem as FreeBSD has great support for most modern hardware.

Later I discovered and learned about many of the tuneable options and specific settings in FreeBSD, which makes it possible for the system administrator to tailer FreeBSD to his specific needs. I eventually ended up using FreeBSD as my main desktop computer for a very long time.

Some of the things I love about FreeBSD are: [...]

• [VIDEO] Linux Laptop Screencast

  A few weeks ago, I wrote about tuning up my Linux laptop for writing. Via YouTube, here’s a very quick (20 minute) screencast. Enjoy!

• Mystical Users | LINUX Unplugged 337

  We make an appeal to keep Linux powerful and avoid the Macification of the desktop, and review the latest developer-focused XPS 13.

  Plus some community news that's getting missed, picks, and more.

• 2020-01-21 | Linux Headlines

  Canonical announces a cloud delivery suite for Android apps, EarlyOOM is on hold for the next Fedora, and ProtonMail open sources its VPN clients.

• KubeInvaders - Gamified Chaos Engineering Tool for Kubernetes

  Some months ago, I released my latest project called KubeInvaders. The first time I shared it with the community was during an Openshift Commons Briefing session. Kubenvaders is a Gamified Chaos Engineering tool for Kubernetes and Openshift and helps test how resilient your Kubernetes cluster is, in a fun way.

• CSI Ephemeral Inline Volumes

  Typically, volumes provided by an external storage driver in Kubernetes are persistent, with a lifecycle that is completely independent of pods or (as a special case) loosely coupled to the first pod which uses a volume (late binding mode). The mechanism for requesting and defining such volumes in Kubernetes are Persistent Volume Claim (PVC) and Persistent Volume (PV) objects. Originally, volumes that are backed by a Container Storage Interface (CSI) driver could only be used via this PVC/PV mechanism.

  But there are also use cases for data volumes whose content and lifecycle is tied to a pod. For example, a driver might populate a volume with dynamically created secrets that are specific to the application running in the pod. Such volumes need to be created together with a pod and can be deleted as part of pod termination (ephemeral). They get defined as part of the pod spec (inline).

  Since Kubernetes 1.15, CSI drivers can also be used for such ephemeral inline volumes. The CSIInlineVolume feature gate had to be set to enable it in 1.15 because support was still in alpha state. In 1.16, the feature reached beta state, which typically means that it is enabled in clusters by default.

  CSI drivers have to be adapted to support this because although two existing CSI gRPC calls are used (NodePublishVolume and NodeUnpublishVolume), the way how they are used is different and not covered by the CSI spec: for ephemeral volumes, only NodePublishVolume is invoked by kubelet when asking the CSI driver for a volume. All other calls (like CreateVolume, NodeStageVolume, etc.) are skipped. The volume parameters are provided in the pod spec and from there copied into the NodePublishVolumeRequest.volume_context field. There are currently no standardized parameters; even common ones like size must be provided in a format that is defined by the CSI driver. Likewise, only NodeUnpublishVolume gets called after the pod has terminated and the volume needs to be removed.

• Reviewing 2019 in Docs

  Hi, folks! I’m one of the co-chairs for the Kubernetes documentation special interest group (SIG Docs). This blog post is a review of SIG Docs in 2019. Our contributors did amazing work last year, and I want to highlight their successes.

  Although I review 2019 in this post, my goal is to point forward to 2020. I observe some trends in SIG Docs–some good, others troubling. I want to raise visibility before those challenges increase in severity.

• Springtime in Switzerland

  During the same week I’ll also be giving a half-day seminar on Raku, which has been generously sponsored by EPFL and so will cost nothing to attend. It’s suitable for anyone who would like a quick but comprehensive overview of this remarkable new programming language.

  Besides making the Raku seminar entirely free, SIB/UNIL/EPFL have done an amazing job
  keeping the prices of the other classes extremely competitive...especially if you can claim a plausible association to any academic institution, either as a student or staff member.

  If you’re looking for some training that’s economical, practical, and just plain fun,
  in a location that’s central, civilised, and simply breathtaking, then this week
  in Switzerland might fit just the bill.

• PyCoder’s Weekly: Issue #404 (Jan. 21, 2020)

• Basic Data Types in Python

  In this step-by-step course, you’ll dig into the basic data types that are built into Python.

• Python 3.7.5 : Django security issues - part 002.

• Python 3.7.5 : Use Django Formsets.

  Django Formsets manage the complexity of multiple copies of a form in a view. 
  This simplifies the task of creating a formset for a form that handles multiple instances of a model.

• Hunting gremlins

  In the UTF-8 files I audit, the only invisible characters I expect to see... er... not see... are whitespace (hexadecimal 20), horizontal tab (09) and newline (linefeed; 0a). All others I call "gremlins". They include carriage return (0d), no-break space (c2 a0), soft hyphen (c2 ad) and another 62 control characters.

  Gremlins are a nuisance. One gremlin causes a shell to hang. Less evil gremlins lurk inside apparently OK strings and cause the strings to be processed weirdly. In the file "demo1", two of the strings contain no-break spaces (in different places), two contain soft hyphens (in different places) and three have no gremlins. 

• A more expressive Bash prompt

  Bash provides some interesting built-in specifiers for the prompt strings PS1. 

• The Mozilla Developer Roadshow: Asia Tour Retrospective and 2020 Plans

  November 2019 was a busy month for the Mozilla Developer Roadshow, with stops in five Asian cities —Tokyo, Seoul, Taipei, Singapore, and Bangkok. Today, we’re releasing a playlist of the talks presented in Asia.

  We are extremely pleased to include subtitles for all these talks in languages spoken in the countries on this tour: Japanese, Korean, Chinese, Thai, as well as English. One talk, Hui Jing Chen’s “Making CSS from Good to Great: The Power of Subgrid”, was delivered in Singlish (a Singaporean creole) at the event in Singapore!

  In addition, because our audiences included non-native English speakers, presenters took care to include local language vocabulary in their talks, wherever applicable, and to speak slowly and clearly. We hope to continue to provide multilingual support for our video content in the future, to increase access for all developers worldwide.

• CRLite: Speeding Up Secure Browsing

  CRLite pushes bulk certificate revocation information to Firefox users, reducing the need to actively query such information one by one. Additionally this new technology eliminates the privacy leak that individual queries can bring, and does so for the whole Web, not just special parts of it. The first two posts in this series about the newly-added CRLite technology provide background: Introducing CRLite: All of the Web PKI’s revocations, compressed and The End-to-End Design of CRLite.

  Since mid-December, our pre-release Firefox Nightly users have been evaluating our CRLite system while performing normal web browsing. Gathering information through Firefox Telemetry has allowed us to verify the effectiveness of CRLite.

• Niko Matsakis: Async Interview #5: Steven Fackler

  Hello! For the latest async interview, I spoke with Steven Fackler (sfackler). sfackler has been involved in Rust for a long time and is a member of the Rust libs team. He is also the author of a lot of crates, most notably tokio-postgres.

  I particularly wanted to talk to sfackler about the AsyncRead and AsyncWrite traits. These traits are on everybody’s list of “important things to stabilize”, particularly if we want to create more interop between different executors and runtimes. On the other hand, in [tokio-rs/tokio#1744], the tokio project is considering adopting its own variant traits that diverge significantly from those in the futures crate, precisely because they have concerns over the design of the traits as is. This seems like an important area to dig into!

• wayland 1.17.91

  This is the alpha release for Wayland 1.18. Here's a highlight of the
  biggest changes:
  
  - Add support for the Meson build system (autotools is still supported
    but will be removed in a future release)
  - Add API to tag proxy objects to allow applications and toolkits to
    share the same Wayland connection
  - Track wayland-server timers in user-space to prevent creating too
    many FDs
  - Add wl_global_remove, a new function to mitigate race conditions with
    globals
  
  Thanks to all contributors!
  
  Full commit history below.
  
  Antonio Borneo (1):
        log: remove "%m" from format strings by using strerror(errno)
  
  Daniel Stone (2):
        build/doc: Ensure destination dir exists despite VPATH
        display-test: Remove unused variables
  
  Drew DeVault (3):
        Document unusual wl_registry.bind new_id behavior
        Add .editorconfig
        Improve description of wl_surface
  
  Emmanuel Gil Peyrot (2):
        cursor: Use memfd_create() when available
        wayland-shm: Don’t set SIGBUS handlers on unshrinkable fd
  
  Emmanuele Bassi (2):
        Support running tests from different build directories
        Add Meson build
  
  Harish Krupo (2):
        docs: Abort configure if docbook-xsl package is missing
        wayland.xml: document invalid_finish error in wl_data_offer.finish
  
  Jiayuan Ren (1):
        adding O_RDWR flag in the open()
  
  Jonas Ådahl (1):
        proxy: Add API to tag proxy objects
  
  Joshua Watt (2):
        scanner: Add configure check for strndup
        Move wl_priv_signal to wayland-server-private.h
  
  Leonid Bobrov (1):
        configure: detect libdl and librt
  
  Liu Wenlong (1):
        server: Fix fake "Address already in use" error
  
  Manuel Stoeckl (13):
        scanner: error when element names will not compile
        tests: Verify that wayland_scanner can catch bad identifiers
        protocol: clarify wl_display.delete_id description
        connection: do not abort when dup(fd) fails
        client: Ignore new requests if display has a fatal error
        client: Don't abort when sending a request fails
        tests: Test that send overflow doesn't abort
        tests: Fix race condition in send overflow test
        tests: Ensure that overflow test always overflows
        event-loop-test: Verify proper timer cancellation
        event-loop-test: Confirm distant timers do not fire
        event-loop: Track timer event sources in userspace
        event-loop-test: Add test to verify timer ordering
  
  Marty E. Plummer (1):
        scanner: prepend protocol name to types symbol
  
  Michael Forney (3):
        Use wl_container_of internally
        Avoid pointer arithmetic on `void *`
        protocol: fix typo in wl_data_offer.set_actions description
  
  Mosè Giordano (1):
        Add $(RT_LIBS) to fixed-benchmark LD dependencies
  
  Pekka Paalanen (2):
        configure.ac: reopen master for regular development
        scanner: include config.h from command line
  
  Scott Anderson (1):
        wayland.xml: Make releases for multiple 'wl_surface.attach' undefined
  
  Simon Ser (22):
        Add releasing.txt
        releasing: adapt for Wayland
        releasing: fixup section numbers
        protocol: allow to send a zero output refresh rate
        client: check event opcode in queue_event
        Update .editorconfig for Python
        Add an automated script to update wl_shm.format
        protocol: add a comment about the wl_shm.format script
        protocol: sync wl_shm.format with libdrm 2.4.99
        server: check global interface on bind
        tests: test that binding to a global with an interface mismatch fails
        protocol: invalid_method is sent on malformed request
        server: add wl_global_set_user_data
        server: add wl_global_remove
        tests: add a test for wl_global_remove
        build: check wayland-scanner version
        Revert "build: check wayland-scanner version"
        meson: use strict wayland-scanner mode
        autotools: use strict wayland-scanner mode
        build: check wayland-scanner version
        protocol: add missing enums for wl_data_device_manager.dnd_action
        build: bump to version 1.17.91 for the alpha release
  
  asynts (1):
        doc: Expand the abbreviation "hw" to "hardware".
  
  orbea (1):
        Add a missing -pthread to fix compile with slibtool.
  
  git tag: 1.17.91
  

• Wayland 1.18 Alpha Released With Meson Support, Connection Sharing

  Wayland 1.18 is adding Meson build system support so that Autotools can be dropped in a future release, API support for allowing applications and toolkits to share the same Wayland connection, better handling over file descriptors, and wl_global_remove as a new function for mitigating race conditions with globals. There are also various test improvements, improved documentation, and various other fixes and minor improvements.

• Linux on Embedded Ryzen with Radeon

  American Micro Devices (AMD) has released the Ryzen processors which works very well with Linux. The embedded processor also contains a Graphical Processing Unit (GPU) which is an AMD Ryzen Vega.

  The board I am using is the IBase 918f-1605 to install Linux. Linux can be installed from a stock ISO, but the system does not perform as well unless using a special Linux kernel from AMD. It also helps to have the proper GPU driver for performance. Stability is much better with the AMD kernel they provide on their website.

• Keith Packard Talks About The Early Politics Of X Window System + Code Licensing

  At last week's Linux.Conf.Au conference was an interesting presentation by longtime X developer Keith Packard on the early days of the pre-X.Org X Window System, the collapse of Unix, and how his views formed on copyleft licenses for building thriving communities.

  Keith's LCA 2020 presentation is focused on the X happenings largely during the 80's and very early 90's. Keith's involvement goes back to the 80's during which he was employed at MIT as part of the X Consortium.

• Keith Packard: lca2020

  I just got back from linux.conf.au 2020 on Saturday and am still adjusting to being home again. I had the opportunity to give three presentations during the conference and wanted to provide links to the slides and videos.

OASIS is pleased to announce that Open Document Format for Office Applications (OpenDocument) v1.3 from the OpenDocument TC has been approved as an OASIS Committee Specification.

The OpenDocument Format is an open XML-based document file format for office applications, to be used for documents containing text, spreadsheets, charts, and graphical elements. OpenDocument Format v1.3 is an update to the international standard Version 1.2, which was approved by the International Organization for Standardization (ISO) as ISO/IEC 26300 in 2015. OpenDocument Format v1.3 includes improvements for document security, clarifies underspecifications and makes other timely improvements.

The OpenDocument Format specifies the characteristics of an open XML-based application-independent and platform-independent digital document file format, as well as the characteristics of software applications which read, write and process such documents. It is applicable to document authoring, editing, viewing, exchange and archiving, including text documents, spreadsheets, presentation graphics, drawings, charts and similar documents commonly used by personal productivity software applications.

This Committee Specification is an OASIS deliverable, completed and approved by the TC and fully ready for testing and implementation.

• Setting up passwordless Linux logins using public/private keys

• Installing Oracle Java SE 11 on Ubuntu 18.04

• How to Install Vagrant on Debian 10 Linux

• How to configure SFTP with restricted directory access

• How to install League of Legends on Linux Mint 19.3

• How to make sure you can play videos from youtube and videos from netflix on vivaldi or other browsers

• distri: 20x faster initramfs (initrd) from scratch

• Fun with grub2-install "not a directory"

• Configure the OpenShift Image Registry backed by OpenShift Container Storage

Plasma 5.18 LTS Beta has been released, which brings many exciting new features to a computer near you, especially if you’re upgrading from our previous LTS release, Plasma 5.12. Of course for us developers this now means that a stable git branch has been created and we can work on new stuff on master to eventually become Plasma 5.19, scheduled for an early June 2020 release. This blog post is less about KDE code, though.

• Planetary Sanitations Inc, a free and open source world exploration mecha roguelike

  A game I completely forgot to cover some time ago is Planetary Sanitations Inc., a free and open source roguelike that has you exploring different worlds. As you explore, you piece together a mech unit from various modules, each of which can be destroyed individually.

  Thankfully, even though I forgot about it there was a big update to it recently which popped up in my feed so here we are. It's another game made with Godot Engine, with the source code available up on GitLab. The recent update to it brings in some first steps towards polishing the experience with a proper starting menu and a small tutorial.

• Terminal Phase, a space shooter you can play in a Terminal window

  Ever wanted to play a space shooter in your Terminal window? Well, now you can with Terminal Phase which was announced recently.

  The developer, Christopher Lemmer Webber, is a name some of you might know as they're involved in the ActivityPub specification and they're the co-founder of GNU MediaGoblin amongst other things. Terminal Phase was actually released as a result of hitting a goal on their Patreon page, funding their work in the free software community.

• The Humble Europa Universalis IV Bundle is live ready to take your time away

  That's a pretty ridiculously good deal, considering just how much playable content is included with all of that together. As usual though, there's higher tiers as well.

  If you pay more than the average there's also: Europa Universalis IV: Rights of Man, Europa Universalis IV: Mare Nostrum, Europa Universalis IV: The Cossacks, Europa Universalis IV: Common Sense and Europa Universalis IV - El Dorado.

• The original Half-Life games are now free to play until Half-Life: Alyx launches

  Valve have made their original Half-Life titles all the way up to Half-Life 2: Episode Two free to play for a few months.

  This is to build up excitement for their VR-only title, Half-Life: Alyx, which releases in March. Which we still don't know if it will support Linux or not, I'll be speaking to Valve more about that closer to the time. It likely all depends on the state of SteamVR at the time.

• These Samsung, Xiaomi, Nokia phones to get Android 10 OS update

• Galaxy A11 and Galaxy M11 reconfirmed to run Android 10 by the WFA

• LG G8 ThinQ Android 10 rollout continues as Verizon update follows Sprint (Update)

• Pocophone F1 stable Android 10 update rollout begins

• Samsung Good Lock's Android 10-supporting 2020 update coming on February 3

• How to set default apps in Android 10

• How to prevent apps "sleeping" in the background on Android

• How to share your location from an Android device with any contact, even if they don't have a Google account

• How to create a WhatsApp group using your iPhone or Android device

• Here's how to backup & export chats before WhatsApp drops Android and iOS support

• WhatsApp exceeds 5 Billion installs on Android

• Android users, delete these 30 apps from your smartphone right now!

• Popular Android Camera Apps Found Spying On Users

• Explore Android OS alternatives for enterprise use

• Best Android Auto head unit 2020: improve your in-car entertainment

• The best Android phones available at Verizon Prepaid

• Here are 11 features that need to be in Android 11

• Android 11 will harden hidden API restrictions and remove meta-reflection bypass

• REALTEK AND JIUZHOU PARTNER WITH NAGRA ON ANDROID TV REFERENCE PROGRAM FOR PAY-TV OPERATORS

• NAGRA Adds Two Tech Firms to Android TV Fast Track Program

• Google Tasks for Android hints at Hangouts Chat integration [APK Insight]

• Google launches experimental Digital Wellbeing Android apps

• Google Pixel 4 With Android R Stops By Geekbench

• The Android Police Q&A Stream is live!

• Knobby Volume Control turns your Android phone’s volume slider into a volume control knob

• Nokia 2.3 stock Android phone released in USA for $129

One of the nice things about buying a Google Chromebook is that the operating system receives automatic security and feature updates delivered straight from Google — which means that it’ll stay up to date years after your Android phone stops receiving official updates.

But up until recently, Google only promised 5 to 6.5 years of updates… which might seem fine if you spend $200 or less on a cheap Chrome OS laptop, but which can be rather frustrating if you drop $999 or more on a premium model.

• Road Map for 2020

  Following the last year's leitmotif of "bridging worlds", we turn our attention to the removal of the hurdles faced by aspiring developers and users. During the annual road-map discussion on our mailing list, we identified four tangible approaches towards that goal. First, making Sculpt OS more user friendly. Second, reinforcing trust in Genode by fostering the framework's high quality. Third, making the tooling around Genode a joy to use. And finally, the illustration of Genode's versatility in the form practical use cases.

• Genode OS Draws Up 2020 Plans Of USB Audio, A Kernel Written In Ada

  The Genode operating system framework that's been going strong for over a decade and continuing to employ a micro-kernel architecture continues to plan for an interesting future.

  The twelve year old Genode OS open-source project has drawn up an interesting road-map for 2020. Some of their plans for this year include:

  - 64-bit ARM (specifically the i.MX8 SoC) support for its general purpose Sculpt OS operating system.

• Incentivizing Accessible Design

  When scholars contemplate the legal tools available to policymakers for encouraging innovation, they primarily think about patents. If they are keeping up with the most recent literature, they may also consider grants, prizes, and taxes as means to increase the supply of innovation. But the innovation policy toolkit is substantially deeper than that. To demonstrate its depth, this Article explores the evolution of designs that help people with disabilities access the world around them. From artificial limbs to the modern wheelchair and the reshaping of the built environment, a variety of legal doctrines have influenced, for better and for worse, the pace and direction of innovation for accessible design.

  This Article argues that two of the most important drivers of innovation for accessible design have been social welfare laws and antidiscrimination laws. Both were responsible, in part, for the revolution in accessibility that occurred in the second half of the twentieth century. Unlike standard innovation incentives, however, these laws operate on the “demand side.” Social welfare laws and antidiscrimination laws increase the ability and willingness of parties to pay for accessible technology, ultimately leading to greater supply. But in doing so, these laws generate a different distribution of the costs and benefits of innovation. They also produce their own sets of innovation distortions by allowing third parties to make decisions about the designs that people with disabilities have to use.

  The law can promote innovation, and it can hinder it. The law’s relationship to the wheelchair, the most important accessibility innovation of the twentieth century, produced both results. Policymakers have choices about which legal incentives doctrines they can use and how they can use them. This Article evaluates those tools, and it provides guidelines for their use to encourage accessible technology in particular and innovation generally.

• Introduction to the Linux terminal commands

  Those of you just beginning to learn the basics of Linux may be interested in a great video published by the YouTube channel Explaining Computers. The Linux Terminal tutorials are aimed at those of you moving from the Microsoft Windows operating system as well as users of the Raspberry Pi mini PC and similar. The 20 minute video covers a range of Linux terminal commands and Linux concepts, including navigating and manipulating drives and directories using the commands pwd, ls, lsblk, cd, mkdir, rmdir, cp, and mv.

  If you would like to play around with the Linux commands but don’t have a Linux system you can also use a terminal emulator. A program that allows the use of the terminal in a graphical environment. Here are some free, commonly-used terminal emulators by operating system : Mac OS X: Terminal (default), iTerm 2 – Windows: PuTTY – Linux: Terminal, KDE Konsole, XTerm

• How to install Microsoft fonts on Linux