Linux

Linux - rubenwardy's blog https://blog.rubenwardy.com/tags/linux/
Setting up fingerprint auth on Kubuntu (Thinkpad X1)

Using a fingerprint to unlock your computer or elevate privileges (sudo) is a nice convenience, saving time during daily use of a computer. This article will show you how to set up fingerprint authentication on Ubuntu KDE. You’ll still need to enter your password to login, but once logged in you will be able to use a fingerprint to unlock or use sudo.

This guide is based on a Thinkpad X1 running Kubuntu 22.04, but it should work for most laptops with supported fingerprint sensors. You can check whether your fingerprint sensor is supported by searching for “Linux fingerprint” and your computer’s make/model. The Arch wiki is especially useful for this sort of thing, even if you don’t use Arch.

It goes without saying that this comes without warranty; backup your data, and have a LiveUSB ready. There are some pointers on recovering from mistakes at the bottom of this page. Luckily, I never needed to use a LiveUSB, I could easily recover from a virtual console.

Devkit CLI: Upload your game to Steam Deck from your dev computer

Steam Deck is a new portable gaming console from Valve. The Deck is a very open platform as it’s a full Linux PC, making it very easy to use third-party games and stores. All Decks can act as a devkit machine, and come with devkit tools preinstalled. There was a Steam Deck Devkit edition, but that was a preproduction version of the hardware to allow game developers to test their games.

This article will show you how to upload and run your games on the Steam Deck from your development computer, using a VSCode task or a script you can use in any editor. Whilst you could develop on the Deck directly, it would require setting up a new dev environment. Being able to develop on your computer and test on the Deck allows you to reuse your current dev environment.

Steam Deck is Awesome

My Steam Deck arrived two months ago, and I’ve been having a blast ever since. I’m not much of a gamer; RimWorld and Skyrim are the only two games I’ve spent more than 100 hours in. I find it hard to play a game without wanting to do game dev instead. But with the Deck, I’ve been playing the games that have been on my play list for a while.

Simple Kernel in C

During the second year of university, I created a kernel for the ARMv7 instruction set. I went above and beyond what was required on this project, achieving a clean design and features such as a blocked process queue, piping, kill, and a simple filesystem. This was my favourite coursework so far. I found it very interesting to learn about and implement the things that we take for granted as programmers.

I tried to stick to POSIX as much as possible, and stuck to the Linux method of having everything as either a file or process. Because pipes and standard in/out were both “files”, I was able to implement both popen and piping of the output of a process to another process.

Convert folder of images to PDF with filenames

Here is a shell script specific for GNU/Linux based operating systems to use. On different operating systems the convert commands will be the same, but the for loop will be different due to a different batch file syntax.

rm /tmp/imageex -r
mkdir /tmp/imageex
for filename in *.png; do
    echo "Processing $filename"
    convert $filename -background White \
        label:$filename -gravity Center \
         -append -pointsize 14 \
        /tmp/imageex/$filename.png
done
echo "Exporting to PDF..."
convert /tmp/imageex/*.png output.pdf
echo "Done."