Matthias Vandermaesen netsensei

Installing Fedora 30/31 on a Dell XPS 13 9380 series in dual boot mode

This guide describes how to install Fedora 30/31 next to Windows 10 on a Dell XPS 13 9380 series in dual boot.

Keep the stock Windows 10 installation that came with the laptop.
Install Fedora 30 alongside Windows on the hard disk.
Install GRUB as the bootloader allowing you to choose which OS to boot from.

Authored: September 2019

BASH and *NIX learnings

Learning Bash and Unix as I go. This file documents some of the things I learn along the way in a scratchpad fashion.

Documentation

Creating and managing an SSH session in the background

Sources:
https://stackoverflow.com/questions/2241063/bash-script-to-set-up-a-temporary-ssh-tunnel/15198031#15198031
https://lists.gt.net/openssh/dev/48040#48040

Starting an SSH session

$ ssh -M -S my-ctrl-socket -fnNT user@host.tld

Setting Up NodeJS with NVM on Centos 7

Centos 7 offers NodeJS and NPM via yum install. While this is great, it's not optimal because it pins users to the version offered via yum. Moreover, a yum update can easily upgrade the NodeJS version leading to all kinds of breaking. Not what we want.

Luckily, nvm can help us.

In the same vain as rbenv, rvm or plenv: this is a version manager that leaves the "system" node installation alone and allows you to install and manage different versions of nodejs and npm concurrently.

Comparing two files each containing a single column dataset with Perl

Warning! One liners such as these are basically hacks. Please look into the comm program which is part of GNU Coreutils. It basically does all of this without any of the complexity below. See: https://www.gnu.org/software/coreutils/manual/html_node/comm-invocation.html

You have 2 text files, each containing rows of data each having 1 column (e.g. e-mail address, uuids, names, md5 hashes,...). You want to very quickly compare those, spending the least amount of time and energy, looking for ...

... rows both files have in common (intersection)
... rows which are in file A but not in file B.
... rows which are in file B but not in file A.

Setuping PI-Hole FTL DNS on a local network

pihole comes with it's own lightweight DNS server called FTL. It's geared towards easy of use. Even so, setting up this feature can be hard. Here are some lessons I've learned.

In this example:

Your network is setup on 192.168.1.0/24
192.168.1.1 is your DHCP server and IP gateway. (usually your router)
192.168.1.254 is the host running pi-hole

	root:
	- 00_personeel:
	- veiligheid:
	- naam: Jos
	permissies: alleen-lezen
	type: persoon
	- naam: Nancy
	permissies: lezen, schrijven
	type: persoon
	- naam: personeel

	#!/bin/bash

	echo "fetching list of objects";
	curl -s "https://collectionapi.metmuseum.org/public/collection/v1/objects" > list.json;
	echo "[]" > objects.json;

	echo "drawing list of objects";
	ids=$(jq -r '.objectIDs \| .[]' list.json);
	rm list.json;

	// Easily compile plain SCSS or SASS if you want to use Webpack
	// but you're not working on a JS project (React, Typescript, whathaveyou)
	//
	// Why? Webpack does what Grunt/Gulp does with half the configuration.
	// See: https://alligator.io/tooling/webpack-gulp-grunt-browserify/
	//
	// You will need:
	// npm install --save-dev autoprefixer
	// npm install --save-dev css-loader
	// npm install --save-dev file-loader

	# assuming catmandu.yml in the same folder as this script
	# Change bag("document") to the relevant bag name / document type in ES
	# ensure camtandu.yml exists!

	use Catmandu::Sane;

	use Config::Onion;
	use Catmandu;
	use Path::Tiny;
	use Data::Dumper;