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Programming Leftovers

  • Excellent Free Tutorials to Learn Tcl - LinuxLinks

    Tcl (Tool Command Language) is a dynamic programming/scripting language based on concepts of Lisp, C, and Unix shells. Here's our recommended free tutorials to learn Tcl.

  • ROC and Precision-Recall curves - How do they compare?

    Both curves offer two useful information: how to choose the positive class prediction threshold and what is the overall performance of the classification model. The former is determined by selecting the threshold which yield the best tradeoff, in adequation with the prediction task and operational needs. The latter is done by measuring the area under the curves which informs about how good the model is, because by measuring the area under the curves, one computes the overall probability that a sample from the negative class has a lower probability than a sample from the positive class. With scikit-learn, the values can be computed either by using the roc_auc attribute of the object returned by plot_roc_curve() or by calling roc_auc_score() directly for ROC curves and by using the average_precision attribute of the object returned by plot_precision_recall_curve() or by calling average_precision_score() directly for PR curves.

  • Write GIMP scripts to make image processing faster | Opensource.com

    Some time ago, I wanted to give a blackboard-style look to a typeset equation. I started playing around with the GNU Image Manipulation Program (GIMP) and was satisfied with the result. The problem was that I had to perform several actions on the image, I wanted to use this style again, and I did not want to repeat the steps for all the images. Besides, I was sure that I would forget them in no time.

  • Bash wait Command | Linuxize

    wait is a command that waits for the given jobs to complete and returns the exit status of the waited for command. Since the wait command affects the current shell execution environment, it is implemented as a built-in command in most shells. In this article, we’ll explore the Bash built-in wait command.

  • Santiago Zarate: Cron do not send me empty emails
  • Rust & the case of the disappearing stack frames | Inside Rust Blog

    Now that the FFI-unwind Project Group has merged an RFC specifying the "C unwind" ABI and removing some instances of undefined behavior in the "C" ABI, we are ready to establish new goals for the group. Our most important task, of course, is to implement the newly-specified behavior. This work has been undertaken by Katelyn Martin and can be followed here.

Open Hardware: Raspberry Pi, Arduino, Thomas Petazzoni (Bootlin) on Training

  • Qsync fixed on the Pi4 and FF compiled

    The Raspberry Pi4 does not have a hardware battery-backed clock, so relies on getting the date and time from an Internet time server. In EasyOS, Qsync is the utility that does that. At first bootup, QuickSetup has a checkbox to enable getting time from the Internet, which will launch Qsync. At first bootup on the Pi4, if you are going to connect to Internet via wifi, not ethernet, then there won't be an immediate Internet access. No problem, Qsync will run once the Internet connection is established. Qsync will run just once at bootup and after Internet connection. That's fine, but I couldn't understand why it would suddenly stop working. Then discovered that /etc/init.d/qsync was getting its executable-flag cleared.

  • Arduino Blog » This children’s console looks like something straight out of a superhero’s lair

    Kids have wonderful imaginations, and to help students at a primary school have a super time, creator “palladin” was asked to construct a console for them to use. The device features a variety of lights and sci-fi additions, including glowing “reactor” tubes that diffuse light using hair gel and a “memory bank” that emits flashing patterns for a 1950s supercomputer look.

  • Arduino Blog » This pen plotter draws detailed maps the size of walls

    Christopher Getschmann wanted a wall-sized map of the world. He soon realized, however, that it’s tough to actually buy such a map that’s both beautiful and detailed enough to satisfy his cartographic tastes. While many would simply move on to the next “thing,” Getschmann instead took things into his own hands, and built a pen plotter specifically to draw massive 2×3 meter map for his wall.

  • New training course: embedded Linux boot time optimization

    For many embedded products, the issue of how much time it takes from power-on to the application being fully usable by the end-user is an important challenge. Bootlin has been providing its expertise and experience in this area to its customers for many years through numerous boot time optimization projects, and we have shared this knowledge through a number of talks at several conferences over the past years. We are now happy to announce that we have a new training course Embedded Linux boot time optimization, open for public registration. This training course was already given to selected Bootlin customers and is now available for everyone.

Red Hat/Fedora Leftovers

     
  • A brief introduction to Ansible roles for Linux system administration

    In this part one of two articles, learn to use rhel-system-roles with your Ansible deployment to better manage functionality such as network, firewall, SELinux, and more on your Red Hat Enterprise Linux servers.

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  • From Docker Compose to Kubernetes with Podman | Enable Sysadmin

    Use Podman 3.0 to convert Docker Compose YAML to a format Podman recognizes.

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  • Fedora Community Blog: Software Management (RPM, DNF) 2020 retrospective

    On behalf of the RPM and DNF teams, I would like to highlight changes that have appeared in our packages in 2020. Thanks everyone for your bug reports and patches!

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  • Application and data resiliency for Kubernetes

    Using tools like Red Hat OpenShift and Red Hat OpenShift Container Storage, organizations are developing and deploying more stateful applications and microservices at an accelerating pace. According to a recent Enterprise Strategy Group (ESG) research study, 41% of companies currently use containers for production applications. Another 33% use containers for dev/test and pre-production only but plan to use containers for production applications in the next 12 months.

  • Red Hat Introduces Data Resilience for Enterprise Kubernetes Applications

    Red Hat, Inc., the world's leading provider of open source solutions, today introduced new data resilience capabilities for cloud-native workloads with the release of Red Hat OpenShift Container Storage 4.6. This offering from Red Hat Data Services enables customers to extend their existing data protection solutions and infrastructure to enhance data resilience for cloud-native workloads across hybrid and multicloud environments.

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  • Why Red Hat killed CentOS—a CentOS board member speaks

    This morning, The Register's Tim Anderson published excerpts of an interview with the CentOS project's Brian Exelbierd. Exelbierd is a member of the CentOS board and its official liaison with Red Hat. Exelbierd spoke to Anderson to give an insider's perspective on Red Hat's effective termination of CentOS Linux in December, in which the open source giant announced CentOS Linux was to be deprecated immediately—with security upgrades to CentOS Linux 8 ending later in 2021 rather than the 2029 end of support date CentOS users expected.

Zentyal Server 7.0 Development Now Available

Zentyal Development Team today announced the availability of Zentyal Server Development Edition 7.0. This is a new major community release of the Zentyal Linux Server, based on Ubuntu Server 20.04 LTS. This version comes with the most recent versions of all the integrated software, including Samba 4.11 and the latest stable SOGo version. Zentyal Server provides an easy-to-use Linux alternative to Windows Server®. Thanks to the integration of Samba, Zentyal provides native compatibility with the Microsoft Active Directory® and allows transparent management of Windows® clients. It is used by companies and public administrations mainly as a domain and directory server and a file server. The graphical user inferface that Zentyal offers helps to make Linux server management easier for all and specially for new Linux users. Read more