Starting processes while booting (Linux)

When a Linux system is booted, we want certain processes to run immediately. In the old days, that is 25 years ago or so, this was done in „BSD-style“ by having certain magical shell scripts that start everything in the right order. When adding another service, this just had to be added to the shell …

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Perl & Java

How do we use Perl and Java together? Unlike many other languages, that for example run in the JVM, it is not particularly easy to combine them. But that is not the idea. A good starting point is thinking about houses and furniture. While it is perfectly possible to build houses of wood or furniture …

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Getters and Setters

Deutsch When programming in Java, it is kind of part of the language to write classes with attributes and equip these attributes with „getters“ and „setters“. You could do otherwise, but you just don’t. But some criticism is of course allowed. Even if it only applies to the design of future languages or to minor …

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New Java Framework: Functionativity

A new Java framework Functionativity has been announced today. I will totally change the way we work and attract all people who are now using other langauges like Scala, Kotlin, Clojure, Ruby, Perl, C#, PHP, Python, JavaScript … to move to Java, just to be able to use this new framework and gain more efficiency …

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Ansible

We are talking about system administration and system engineering for Linux. Most of this also works more or less the same on Unix, but this is today much less relevant. It is even possible to do some of these things on MS-Windows, but that is another story… So just assume for the time being OS=Linux. …

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Code Reviews

We often read that code reviews are a good idea. Bugs can be found, people are encouraged to keep to team standards, know-how is spread in both directions and code becomes more maintainable. Also it helps sharing responsibility. So basically the time spent for the code reviews is well spent and increases the long term …

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Spline Approximation (Mathematics)

The goal of spline approximation has already been explained in the previous article „Spline Approximation (Introduction)„. This article will cover the mathematics behind this approximation and develop an approach. If you do not care about the mathematics, just skip this article and read the Spline Approximation (Cookbook)“, that will come soon. Spline Interpolation We have …

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Spline Approximation (Introduction)

We sometimes encounter a situation where a number of points with coordinates are given and we want to find a function such that for all of these points we have (interpolation) or (approximation). Most often we say that we want on average to be as small as possible and for whatever reasons usually the quadratic …

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Addresses

Postal addresses seem to be easy: – Name and/or Company – Street and/or PostBox – ZIP Code – Municipality – Country This is true in Germany or Switzerland and a few other countries. I would like to add, that in some large buildings it can be a good idea to add the apartment number, but …

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Functional Scala

I participated online in the conference „Functional Scala 2020“ in London. That it was in London had mostly one relevance, which was the time zone. There was no physical location and all talks were done online. An interesting idea was a virtual location. It consisted of rooms and we could move a dot representing ourselves …

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