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#!/bin/bash

# A script for shutting down an idle VM with GPUs attached when they are idle and there
# are no users logged in. Add the below crontab via `crontab -e` to run this script every
# 10 minutes and append its output to a log:
#
#   */10 * * * * ~/shutdown_idle_gpu_machine.sh >> ~/shutdown_idle_gpu_machine.log 2>&1
#
# This script should live in your HOME directory. Your user should have sudoer privileges.

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// Exercise: Equivalent Binary Trees (https://tour.golang.org/concurrency/7)
// There can be many different binary trees with the same sequence of values stored in it.
// For example, here are two binary trees storing the sequence 1, 1, 2, 3, 5, 8, 13.
// A function to check whether two binary trees store the same sequence is quite complex
// in most languages. We'll use Go's concurrency and channels to write a simple solution.

package main

import (
	"fmt"

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#!/bin/bash
RED='\033[0;31m'
GREEN='\033[0;32m'
CYAN='\033[0;36m'
NC='\033[0m' # no color

# attempts to download the URL specified as argument $1 using wget. If wget isn't
# installed it falls back to curl. If curl isn't installed it prints an error and
# exits.
# usage: download <url> <outfile>

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Kubernetes Notes

Get Dashboard Token

# get the name of the dashboard token secret.
# e.g. kubernetes-dashboard-token-3anjf
kubectl get secrets -n kube-system

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Chattervox on MacOS

Install Direwolf

The official Direwolf User Manual uses MacPorts to manage installation and dependencies. I don't particularly like MacPorts, so here are some instructions for installing Direwolf via Homebrew.

# Install Direwolf via Homebrew
brew install tdsmith/ham/direwolf

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// MIT License
//
// (c) 2018 Brannon Dorsey <brannon@brannondorsey.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

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• experiment_1/
  • hyperparameters.json
  • checkpoints/ (saved model weight checkpoints go in here)
  • notes.txt (general notes and comments about this experiment)
• experiment_2/
• experiment_3/
• etc.

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A comparison of the Mean Squared Error algorithm in C, Python, and JavaScript.

C

gcc mse.c -O3 -o mse -lm
time ./mse

348.172699

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// test if node's event loop is gauranteed to run events in the order they are
// pushed to the event queue. Turns out they DO NOT!!! 10,000 integers appended
// one after the other to append.txt using fs.appendFile() will NOT maintain
// the order of those ints.

const fs = require('fs')

function getAppend(i) {
    return () => {
        fs.appendFile('append.txt', `${i.toString().padStart(3)}\n`, (err) => {

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// JS in payloads/google-home.html
attack()
.then((json) => {
          console.log('The attack was successful! Here is the JSON it exfiltrated:')
          console.log(json)
      },
      err => {
          // there probably isn't even a machine with this IP address...
          console.error('No Google Home found at this IP ')
      }