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Chart.js - Temperature line chart

Chart.js line chart with transparent points and custom labels.

A Pen by rozklad on CodePen.

License.

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

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

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

	#!/bin/bash

	# Configs
	chmod 700 $HOME/.ssh
	chmod 644 $HOME/.ssh/authorized_keys
	chmod 644 $HOME/.ssh/known_hosts
	chmod 644 $HOME/.ssh/config

	# Keys
	chmod 600 $HOME/.ssh/id_rsa

	FROM lambci/lambda:build-python3.7

	ENV \
	POSTGRES_VER=11.4 \
	PSYCOPG_VER=2.8.3 \
	PSYCOPY_MAJ_VER=2.8 \
	PSYCOPG_VER_PATH=PSYCOPG-2-8 \
	PYTHON_VER=3.7

	RUN yum install -y wget tar postgresql-devel

	esphome:
	name: esp32_1
	platform: ESP32
	board: lolin32

	wifi:
	ssid: !secret ssid_iot
	password: !secret password_iot
	manual_ip:
	static_ip: 192.168.0.110

	# One liner
	wget --recursive --page-requisites --adjust-extension --span-hosts --convert-links --restrict-file-names=windows --domains yoursite.com --no-parent yoursite.com

	# Explained
	wget \
	--recursive \ # Download the whole site.
	--page-requisites \ # Get all assets/elements (CSS/JS/images).
	--adjust-extension \ # Save files with .html on the end.
	--span-hosts \ # Include necessary assets from offsite as well.
	--convert-links \ # Update links to still work in the static version.

	# Example ssh config file. Usually located in ~/.ssh/config (user) or /etc/ssh/ssh_config (system)
	# This works on both linux and MacOS

	# Basic ssh commands converted to ssh/config file format



	# Simplest format
	# Run with: "ssh blog" => (equivalent to: "ssh ubuntu@example.com" and "ssh -i ~/.ssh/id_rsa -p 22 ubuntu@example.com")
	Host blog

	#!/bin/bash

	[[ -z "$1" ]] && echo "Please enter a filename. Exiting..."
	[[ -z "$1" ]] && exit 1

	echo
	printf "Stripping annotations from $1... "

	pdftk "$1" output "/tmp/$1 - uncompressed.pdf" uncompress
	LANG=C sed -n '/^\/Annots/!p' "/tmp/$1 - uncompressed.pdf" > "/tmp/$1 - stripped.pdf"