My dear friend & client has just recently opened a bar, K7, just in the middle of Prague’s hip–famous Krymská street. As he wanted to offer discounts to his soon to be regulars, we did a brief brainstorm. How to offer customers loyalty cards, without handing them a plastic thing…

July 2022 has brought us public betas of two impressive AI services for generating original images from text, OpenAI’s DALL·E 2 and Midjourney. Both AIs offer similar “tell me what to paint” (text to image) service. Both use diffusion algorithms to reduce initial noice to an image matching your prompt…

How to make use of Pi-Gen, a tool used to create Raspberry Pi OS images. Today, we’re gonna create our own Pi OS image featuring a Web-Based Kiosk with HDMI-CEC control. Minimalistic and performance-oriented. No desktop environments or Chromes to slow us down. My specific use case is making a…

Next.js ships with a simple, yet powerful router for JSON / REST APIs. There are, however, two features I’ve found missing. Error boundary and HTTP method recognition. Let’s have a look how to handle them. TLDR: npm i next-api-wrapper Exceptions and Errors By default, any Error thrown within an API route will result…

I’ve been using this semi-relational, or SemiSQL, if you’d like, approach to SQL since around 2009. At first, I’d store the data as text or longtext types using PHP’s serialize(), but then I quickly moved to JSON. In late 2015, with MySQL 5.7.8, our prayers were answered and the native…

You can easily run into this with almost any VPS provider. You set up a new instance and login with a generic username and a certificate. But you don’t want to be ubuntu, because you’re dave and your UID=1000 😉 How to rename yourself The Hot Wire Way Just modify the data in /etc/passwd, /etc/shadow and /etc/group. …

As everyone who works with Linux servers, I’ve typed sudo probably more then any other word. Ever. Here are some of my fav shell improvements I use. Shortcut sudo into just s Save yourslef 3/4 strokes every time. Make a bash alias, put this into ~/.bashrc: alias s='sudo' alias sus='sudo -s' Reenter your bash and…

A lot of us use cron & rsync -e ssh for backups. On the backup server, we’d love to chroot for many obvious reasons, but chroot breaks rsync. I’m sure you’ve tried & seen something like this: rsync error protocol version mismatch -- is your shell clean? Here’s my full…