Meikel MeikelLP

The introduction to Reactive Programming you've been missing

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Creating Neat .NET Core Command Line Apps

You can now read this on my (pretty) website! Check it out here.

Every reason to get more HackerPoints™ is a good one, so today we're going to write a neat command line app in .NET Core! The Common library has a really cool package Microsoft.Extensions.CommandlineUtils to help us parse command line arguments and structure our app, but sadly it's undocumented.

No more! In this guide, we'll explore the package and write a really neat

sudo useradd --system --shell /bin/false node_exporter

curl -fsSL https://github.com/prometheus/node_exporter/releases/download/v1.3.1/node_exporter-1.3.1.linux-amd64.tar.gz \
  | sudo tar -zxvf - -C /usr/local/bin --strip-components=1 node_exporter-1.3.1.linux-amd64/node_exporter \
  && sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

Configuring Deutsche Telekom FTTH Access with OpenWRT

After looking for alternatves to the suggested Router from Telekom (AVM FritzBox and HUawei Speedport), I've discovered the possibility of configuring my existing OpenWRT Router to act as gateway to the Telekom FTTH (Fiber To The Home) Magenta Zuhause package.

TL;DR

The WAN interface must be configured as follows (see your Telekom letter):

Protocol: PPPoE
PAP/CHAP username:

CamelCase <--> snake_case conversion with jq

tl;dr

I provide you with 3 jq lib functions that will help you in converting between snake_case and CamelCase.

The interface

I want to change keys in my json from camelcase to snake_case.

	declare @tableName varchar(200)
	declare @columnName varchar(200)
	declare @nullable varchar(50)
	declare @datatype varchar(50)
	declare @maxlen int

	declare @sType varchar(50)
	declare @sProperty varchar(200)

	DECLARE table_cursor CURSOR FOR

	public static class ExtensionMethods {
	public static string ToUnderscoreCase(this string str) {
	return string.Concat(str.Select((x, i) => i > 0 && char.IsUpper(x) ? "_" + x.ToString() : x.ToString())).ToLower();
	}
	}