Some devices come with a console interface, so even though connecting to a serial console is not the most common task, it’s useful to know how to do it. If you, for example, have a Raspberry, you might use a serial connection as well.

In the previous article, I played around with dnsmasq as a tool for setting up local DNS caching. I’ll follow up on that and measure how much faster this setup actually is.

I’ve recently started using dnsmasq for local DNS caching, so in order to review the whole setup, I’ve decided to write this article. It’s all much easier than you might think, just a few keystrokes away from using a local DNS cache and even DNS over a secure protocol, which as a whole can improve both performance and security.

It’s a widespead notion that premature optimization is bad, or as many say, the root of all evil. Some add other bits into the discussion such as optimization without prior measurement is always premature. I don’t have specific developer advice in this area (well, I’m not a developer after all), but I’ll share my personal opinion on why I think IT world seems difficult to many in regard to this very topic.

This article is a short summary of some of the most important commands, utilities and ways used for working with Perl modules. As usual, I’ll use my Manjaro distribution, therefore some of the examples will circle around pacman/pamac as a package manager.

As a regular Linux user, I’m aware of the fact that command line can save me a lot of time. In the light of the current COVID-19 pandemic, I’d like to see some statistics printed out in my terminal window. I’ll build this utility in Perl, it will consist of two parts - a module for getting the data and a frontend part that will pretty print those data into a terminal window.

The Czech Republic currently consists of 14 regions. Zip codes in the CZE consist of 5 digits, first 2 - 3 of them representing a city, or (city) district. After first 3 digits, a space is usually written. It’s a common trap to think that it’s easy to go from a zip code to region. It’d make sense, but due to historical reasons, it’s not the reality.