I reduced the startup time of my shell by one second. Here’s how: What I do I work a lot with the shell (or “Terminal” app on MacOS), mostly kubectl, git, terraform and docker. And of course I use the absolutely best shell of all, oh-my-zsh. The Problem I noticed that recently the startup time for a new shell (or new tab) has grown longer than a second. That’s annoying, because usually when I open a new tab, I want to quickly check on something, like the logs of a pod or if I have committed something in a different project.

Apples Time Machine is a great backup solution, you only have to do one thing: Connect your disk from time to time.

Since that is way harder than it sounds, there’s a second option: Buy a 329€ Time Capsule and do backups over wifi!

That’s too expensive? Here’s how to build your own Time Capsule with a Raspberry Pi 3 and an external hard drive.

Sonoff takes the standard ESP8266 chip and adds two things:

  • a casing with wifi and great connectors and
  • a custom OS and an app to control the devices.

Unfortunately, the second addition also means that all communication goes through Sonoff’s servers. Here’s how to get rid of that. Without soldering or connecting anything.




Jannik Arndt: “Musicista — A Framework for Computational Musicology”. Masterarbeit, 2014.    

Jannik Arndt: “Erkennung von Motiv- und Themenvariationen”, in Gesellschaft für Informatik (Hrsg.): Informatiktage 2014, LNI S-13, Potsdam, 2014 (ISBN 978-3-88579-447-9)  

Jannik Arndt, Thomas Meents, Bernd Nottbeck: “Multidimensional Process Mining mit dem Process Cube Explorer”, in Gesellschaft für Informatik (Hrsg.): Informatiktage 2014, LNI S-13, Potsdam, 2014 (ISBN 978-3-88579-447-9)  


Jannik Arndt: “Genetic Mining und Heuristic Mining”. 2013.  

Ira Diethelm, Jannik Arndt, Malte Dünnebier, Jörn Syrbe: “Informatics in Schools: Local Proceedings of the 6th International Conference ISSEP 2013 - Selected Papers”, Commentarii informaticae didacticae, Universitätsverlag Potsdam, 2013.  


Jannik Arndt: “Forderungen an ein Datenmodell für Rekombination als Ansatz für Künstliche Kreativität”, in Proc. 3rd IEEE Germany Student Conference, Passau, 2012.  

Jannik Arndt: “Rekombination — Einführung in die Künstliche Kreativität”. Bachelorarbeit, 2012.    


Einführung in LaTeX