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Programming Leftovers

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  • The Basics of R (in Spanish!)

    Hello everyone! This blog post is a bit different from usual posts in that I’d like to make a very exciting announcement about an upcoming course launch.

    Part of my vision with R for Ecology is to make as accessible as possible to as many people as possible—especially ecologists and other scientists. Understanding how to work with, organize, visualize, and analyze data is essential for doing good science. Either way, I’m very fortunate to have partnered with a fantastic biologist and ecologist from Argentina named Joaquin Cochero who has done an outstanding job translating my entire Basics of R (for ecologists) course into Spanish!

  • 10 New books added to Big Book of R

    We’re off to a great start (book wise!) for 2022. Here’s 10 new additions to Big Book of R. Quite a few more paid versions of books in this round and they look good.

    Thanks to Burak Aydin, Manika Lamba, Mauricio Vargas Sepúlveda, Samrit Pramanik , Kurt Taylor Gaubatz for some of the additions.

  • [Old] ldd arbitrary code execution

    The ldd utility is more vulnerable than you think. It's frequently used by programmers and system administrators to determine the dynamic library dependencies of executables. Sounds pretty innocent, right? Wrong!

    In this article I am going to show you how to create an executable that runs arbitrary code if it's examined by ldd. I have also written a social engineering scenario on how you can get your sysadmin to unknowingly hand you his privileges.

    I researched this subject thoroughly and found that it's almost completely undocumented. I have no idea how this could have gone unnoticed for such a long time. Here are the only few documents that mention this interesting behavior: 1, 2, 3, 4. [...]

  • The best free, open-source supply-chain security tool? The lockfile

    tl;dr: Lockfiles often protect you from malicious new versions of dependencies. When something bad happens, they empower you to know exactly which systems were affected and when, which is critical during incident response. This posts discusses "why lockfiles" and the details of setting them up properly across ~9 different package managers.

  • SWAR explained: parsing eight digits

    It is common to want to parse long strings of digits into integer values. Because it is a common task, we want to optimize it as much as possible.

    In the blog post, Quickly parsing eight digits, I presented a very quick way to parse eight ASCII characters representing an integers (e.g., 12345678) into the corresponding binary value. I want to come back to it and explain it a bit more, to show that it is not magic. This works in most programming languages, but I will stick with C for this blog post.

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today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

Red Hat Hires a Blind Software Engineer to Improve Accessibility on Linux Desktop

Accessibility on a Linux desktop is not one of the strongest points to highlight. However, GNOME, one of the best desktop environments, has managed to do better comparatively (I think). In a blog post by Christian Fredrik Schaller (Director for Desktop/Graphics, Red Hat), he mentions that they are making serious efforts to improve accessibility. Starting with Red Hat hiring Lukas Tyrychtr, who is a blind software engineer to lead the effort in improving Red Hat Enterprise Linux, and Fedora Workstation in terms of accessibility. Read more

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Android Leftovers