Enrico Lamperti elamperti

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

Common Ledger CLI Commands

Income vs expenses this month?

$ ledger balance income expenses --period "this month"

What did my budget look like at a certain date?

	#!/bin/sh
	# see: https://github.com/RMerl/asuswrt-merlin/wiki/Custom-DDNS#google-domains
	# this script could go into /jffs/scripts of a router running Merlin's asus-wrt firmware
	# you must then choose the "Custom" option for DDNS in the router's web interface
	# it registers the WAN IP of the router with Google Domains' DDNS system

	# get your login info from yout Google Domains dashboard
	IP=$1
	USER=
	PASS=

	import requests
	import time
	import json

	token = ''

	#Delete files older than this:
	ts_to = int(time.time()) - 30 * 24 * 60 * 60

	def list_files():

	fallocate -l 4G /swapfile
	chmod 600 /swapfile
	mkswap /swapfile
	swapon /swapfile
	echo "/swapfile none swap sw 0 0" >> /etc/fstab

	"""ledger journal parser

	We use this to parse the ledger file because we want to preserve the
	exact format of the file including spaces, etc. It maps the parsed
	transaction to the origin lines of the file.

	"""
	import ledger

	This snippets add super Simple Node.js String Colors Support.

	See here:
	http://stackoverflow.com/questions/32474241/node-js-terminal-color
	http://stackoverflow.com/questions/9781218/how-to-change-node-jss-console-font-color

	# VERY IMPORTANT! After each kernel update or dkms rebuild the modules must be signed again with the script
	# ~/.ssl/sign-all-modules.sh

	# Place all files in ~/.ssl folder
	mkdir ~/.ssl
	cd ~/.ssl

	# Generate custom keys with openssl
	openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -subj "/CN=Owner/"