Nikolay Botev nikolaybotev

Screen Cheatsheet

Technically all the commands in this section apply to screen sessions. For brevity, we refer to screen sessions as simply screens.

screen

	const socketPath = "/tmp/mock-server";

	// Needed if starting with node --watch
	try {
	await Deno.remove(socketPath);
	} catch (e) {
	// ignore
	}

	let server = Deno.serve({ path: socketPath }, (_req) => new Response("Hello, world."));

	const asyncGeneratorInstancePrototype = Object.getPrototypeOf(async function*(){}());
	const AsyncGeneratorPrototype = Object.getPrototypeOf(asyncGeneratorInstancePrototype);
	let AsyncIteratorPrototype;
	if (AsyncGeneratorPrototype === Object.prototype) {
	// Fix-up for babel's transform-async-generator-functions
	AsyncIteratorPrototype = {};
	const newAsyncGeneratorPrototype = Object.create(AsyncIteratorPrototype);
	Object.setPrototypeOf(asyncGeneratorInstancePrototype, newAsyncGeneratorPrototype);
	} else {
	AsyncIteratorPrototype = Object.getPrototypeOf(AsyncGeneratorPrototype);

	const asyncGeneratorInstancePrototype = Object.getPrototypeOf(async function*(){}());
	const AsyncGeneratorPrototype = Object.getPrototypeOf(asyncGeneratorInstancePrototype);
	let AsyncIteratorPrototype;
	if (AsyncGeneratorPrototype === Object.prototype) {
	// Fix-up for babel's transform-async-generator-functions
	AsyncIteratorPrototype = {};
	const newAsyncGeneratorPrototype = Object.create(AsyncIteratorPrototype);
	Object.setPrototypeOf(asyncGeneratorInstancePrototype, newAsyncGeneratorPrototype);
	} else {
	AsyncIteratorPrototype = Object.getPrototypeOf(AsyncGeneratorPrototype);

	let c1 = require('./currency-rates-2.json')

	console.log('Date,', c1.from, 'to', c1.to)

	let c1b = c1.batchList[0]
	let ts = c1b.startTime
	for (let i = 1; i < c1b.rates.length; i += 1) {
	let actualrate = c1b.rates[i] - c1b.rates[0]
	console.log(new Date(ts).toLocaleDateString() + ', ' + actualrate)
	ts += c1b.interval

	// Brute force compound interest loan payment calculator

	// Inputs
	let amount = 100_000 // dollars
	let interest = 10 // percent per year
	let term = 30 // years

	// Monthly Payment
	let monthly_interest = (interest / 12) / 100
	let no_of_payments = term * 12

	#!/bin/bash

	# pi-bootstrap
	#
	# Setup an Ubuntu Raspberry Pi image for headless boot.
	#
	# Copyright Nikolay Botev, MIT License
	#

	# Default settings

	(function () {
	function toCtDate(event) {
	const p2 = s => s.toString().length == 1 ? "0" + s : s;
	return `${p2(event.getUTCMonth()+1)}/${p2(event.getUTCDate())}/${event.getUTCFullYear()} ${p2(event.getUTCHours())}:${p2(event.getUTCMinutes())}:${p2(event.getUTCSeconds())}`;
	}

	const coinMap = {
	"Dogecoin": "DOGE",
	"Ethereum": "ETH"
	}

	[Unit]
	Description=Turn Off LED %i
	After=network.target

	[Service]
	Type=oneshot
	RemainAfterExit=yes
	ExecStart=/bin/sh -c 'echo 0 > /sys/class/leds/%i/brightness'
	ExecStop=/bin/sh -c 'echo 255 > /sys/class/leds/%i/brightness'

	UPSTREAM_IFACE="${1:-eth1}"

	# IPv4 and IPv6

	for iptables in iptables ip6tables; do
	# :INPUT
	# - returning traffic
	sudo $iptables -A INPUT -i $UPSTREAM_IFACE -m state --state ESTABLISHED,RELATED -j ACCEPT
	# - ping
	sudo $iptables -A INPUT -i $UPSTREAM_IFACE -p icmp -j ACCEPT