Chad Mayfield chadmayfield

Make Ubuntu packages 90% faster by rebuilding them

TL;DR

You can take the same source code package that Ubuntu uses to build jq, compile it again, and realize 90% better performance.

Setting

I use jq for processing GeoJSON files and other open data offered in JSON format. Today I am working with a 500MB GeoJSON file that contains the Alameda County Assessor's parcel map. I want to run a query that prints the city for every parcel worth more than a threshold amount. The program is

How to use:

./wordle.sh

Or try the unlimit mode:

Ubuntu dnsmasq adblock

Ad-blocking with dnsmasq on Ubuntu configuration

Install dnsmasq:

sudo apt update
sudo apt install dnsmasq

How to resize a qcow2 disk image on Linux

This example takes olddisk.qcow2 and resizes it into newdisk.qcow2, extending one of the guest's partitions to fill the extra space.

1. qcow2 format

1.1. Verify the filesystems of `olddisk.qcow2`

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:

RKE2 commands

Updated on May 29 to accommodate etcd container not having /bin/sh available anymore.

Install

curl -sL https://get.rke2.io | sh
systemctl daemon-reload
systemctl start rke2-server

	# train_grpo.py
	#
	# See https://github.com/willccbb/verifiers for ongoing developments
	#
	"""
	citation:

	@misc{brown2025grpodemo,
	title={Granular Format Rewards for Eliciting Mathematical Reasoning Capabilities in Small Language Models},
	author={Brown, William},

	// init
	let xhr = new XMLHttpRequest()
	let domain = 'https://read.amazon.com/'
	let items = []
	let csvData = ""

	// function
	function getItemsList(paginationToken = null) {
	let url = domain + 'kindle-library/search?query=&libraryType=BOOKS' + ( paginationToken ? '&paginationToken=' + paginationToken : '' ) + '&sortType=recency&querySize=50'
	xhr.open('GET', url, false)

	#!/bin/bash
	# Encrypt an existing partition with LUKS2 on Ubuntu 20.04 LTS

	# DISCLAIMER: USE AT YOUR OWN RISK AND MAKE BACKUPS
	# Made for my personal use and has almost NO error checking!!

	# Based on instructions from:
	# https://wiki.archlinux.org/index.php/dm-crypt/Device_encryption#Encrypt_an_existing_unencrypted_filesystem

	DISK="$1"

	opendb () {
	[ ! -f .env ] && { echo "No .env file found."; exit 1; }

	DB_CONNECTION=$(grep DB_CONNECTION .env \| grep -v -e '^\s*#' \| cut -d '=' -f 2-)
	DB_HOST=$(grep DB_HOST .env \| grep -v -e '^\s*#' \| cut -d '=' -f 2-)
	DB_PORT=$(grep DB_PORT .env \| grep -v -e '^\s*#' \| cut -d '=' -f 2-)
	DB_DATABASE=$(grep DB_DATABASE .env \| grep -v -e '^\s*#' \| cut -d '=' -f 2-)
	DB_USERNAME=$(grep DB_USERNAME .env \| grep -v -e '^\s*#' \| cut -d '=' -f 2-)
	DB_PASSWORD=$(grep DB_PASSWORD .env \| grep -v -e '^\s*#' \| cut -d '=' -f 2-)