Christian Trutz trutzonline

trutzonline / privacy.sh

Created August 22, 2025 09:50

RSA encryption and decryption

	# generate rsa keypair
	openssl genrsa -out keypair.pem 4096

	# display public key
	openssl rsa -in keypair.pem -pubout

	# encrypt plain text
	openssl rsautl -encrypt -pubin -inkey alice-public.pem -in plain.txt \| base64 > encrypted.txt

	# decrypt encrypted test

trutzonline / ca

Last active December 28, 2024 17:54

create CA (certificate authority), server and client certificate for TLS communication

	#!/bin/bash

	if [ -n "$1" ]; then
	BASE_DIR="$1"
	if [ ! -d "$BASE_DIR" ]; then
	echo "$BASE_DIR does not exist and will be created"
	mkdir -p -v $BASE_DIR
	fi
	else
	BASE_DIR="."

trutzonline / alias.sh

Created March 16, 2021 06:09

Git alias

	# Commit Id of HEAD
	git rev-parse HEAD

	# Find all children of HEAD
	git rev-list --children --all \| grep $(git rev-parse HEAD) \| head -1

	# Find first child of HEAD (children[1] is the Commit Id of HEAD)
	git rev-list --children --all \| grep $(git rev-parse HEAD) \| head -1 \| awk '{split($0,children," "); print children[2]}'

	# Checkout fist child commit

trutzonline / create-k8s-cluster-do.sh

Last active February 14, 2020 15:45

New Kubernetes cluster on Digital Ocean

	# create cluster via website
	doctl kubernetes cluster kubeconfig save [clustername]
	kubectl cluster-info

	# install cert-manager
	kubectl apply --validate=false -f https://raw.githubusercontent.com/jetstack/cert-manager/v0.13.0/deploy/manifests/00-crds.yaml
	kubectl create namespace cert-manager
	helm repo add jetstack https://charts.jetstack.io
	helm repo update
	helm install cert-manager jetstack/cert-manager --namespace cert-manager --version v0.13.0

trutzonline / brew.sh

Last active February 13, 2020 21:14

kubernetes cluster setup

	# see also https://brew.sh/

	# fetch the newest version of Homebrew
	brew update

	# upgrade outdated, unpinned formulae using the same options they were originally installed with
	brew upgrade

trutzonline / git-repos-konsolidieren.sh

Created January 28, 2019 05:36

Git Repositories konsolidieren

	git remote add other /path/to/XXX
	git fetch other
	git checkout -b ZZZ other/master
	mkdir ZZZ
	git mv stuff ZZZ/stuff # repeat as necessary for each file/dir
	git commit -m "Moved stuff to ZZZ"
	git checkout master
	git merge ZZZ --allow-unrelated-histories # should add ZZZ/ to master
	git commit
	git remote rm other

trutzonline / imageToText.gs

Created March 16, 2017 15:12 — forked from tagplus5/imageToText.gs

google apps script image to text ocr

	function doGet(request) {
	if (request.parameters.url != undefined && request.parameters.url != "") {
	var imageBlob = UrlFetchApp.fetch(request.parameters.url).getBlob();
	var resource = {
	title: imageBlob.getName(),
	mimeType: imageBlob.getContentType()
	};
	var options = {
	ocr: true
	};