Fabian Topfstedt fabiant7t

Create Root CA (Done once)

Last update: Nov 2025.

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl ecparam -genkey -name secp384r1 | openssl ec -aes256 -out rootCA.key

Get/set ID3 meta tags using ffmpeg

A quick guide on how to read/write/modify ID3 metadata tags for audio / media files using ffmpeg.

FFmpeg has a free-form command line option that allows the user to specify key-value-pairs for encoding metadata. Let's take a look.

1. Read ID3 metadata

To list all global metadata tags for a media file, just set an input but no output file.

Step 0: SSH into the server

You will be provided with a domain name looking like xxxxx.ubucon.abolivier.bzh, which points to your dedicated VPS. To access the server's command line, run ssh ubuntu@xxxxx.ubucon.abolivier.bzh from a terminal (or connect with your favourite SSH client with the user ubuntu), and use the password ubucon2019.

Step 1: Install the Matrix.org repository

wget -qO - https://packages.matrix.org/debian/matrix-org-archive-keyring.gpg | sudo apt-key add -
sudo add-apt-repository "deb https://packages.matrix.org/debian/ bionic main"

Dactyl & Dactyl Manuform Case Preparation
https://keeb.io/products/amoeba-single-switch-pcbs
https://lewisf.com/dactyl-manuform/ hold ; and use hjkl to left,right, up,down
Both part needs to have ProMicro MicroController so It can use the QMK Firmware for controling the keys on keyboard itself
4x6 is the way to go

There’s a strong trend for ergonomic keyboards to reduce the number of keys, mostly becouse of QMK framework that allows layering. People usually prefer less rows.

Learn Go in ~5mins

This is inspired by A half-hour to learn Rust and Zig in 30 minutes.

Basics

Your first Go program as a classical "Hello World" is pretty simple:

First we create a workspace for our project:

Linux Desktop on Apple Silicon in Practice

NOTE: Time flies, and it's been almost five years(!) since I wrote this. Beaware the text below is now outdated (e.g., now Asahi Linux has graphics acceleration even better than this). The commands listed are up-to-date.

I bought M1 MacBook Air. It is the fastest computer I have, and I have been a GNOME/GNU/Linux user for long time. It is obvious conclusion that I need practical Linux desktop environment on Apple Silicon.

	Note: The boostcript ARCH must be the same that your server architecture

	$scw images --no-trunc -a -f type=bootscript
	REPOSITORY TAG IMAGE ID CREATED REGION ARCH
	x86_64_4_5_7_debug_3 <bootscript> 716da634-b7c3-45c8-9fd2-87ade5eeabe6 n/a fr-1 [x86_64]
	x86_64_4_5_7_docker_4 <bootscript> aa9f03c9-5d0e-42bb-82b1-0a73e29501a0 n/a fr-1 [x86_64]
	armv7l_4_5_7_apparmor_4 <bootscript> 5365dab9-2dbd-483c-8c59-a8f96fa68f06 n/a fr-1 [arm]
	armv7l_4_5_7_docker_4 <bootscript> 6a2585eb-7273-472a-b277-5898bab8ad33 n/a fr-1 [arm]
	armv7l_4_4_21_std_1 <bootscript> 5361da3d-43ea-466e-9e56-fc105db3ac9f n/a fr-1 [arm]
	armv7l_Rescue <bootscript> a5485

	#!/usr/bin/env python

	"""
	How to use it:
	1. Just `kill -2 PROCESS_ID` or `kill -15 PROCESS_ID`,
	The Tornado Web Server Will shutdown after process all the request.
	2. When you run it behind Nginx, it can graceful reboot your production server.
	"""

	import time

	# kubernetes - is an open source system for managing containerized
	# applications across multiple hosts, providing basic mechanisms for
	# deployment, maintenance, and scaling of applications.
	# See: https://kubernetes.io

	function __kubectl_no_command
	set -l cmd (commandline -poc)
	if not set -q cmd[2]
	return 0
	end

	#! /usr/bin/env ruby

	# NOTE: Requires Ruby 2.1 or greater.

	# This script can be used to parse and dump the information from
	# the 'html/contact_info.htm' file in a Facebook user data ZIP download.
	#
	# It prints all cell phone call + SMS message + MMS records, plus a summary of each.
	#
	# It also dumps all of the records into CSV files inside a 'CSV' folder, that is created