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Source: https://www.wired.com/story/5-useful-terminal-tricks-for-mac/

Set shutdown timer

sudo shutdown -h \+60

Cancel shutdown timer

sudo killall shutdown

Prevent machine and display from falling asleep

caffeinate -u -t 3600

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The following explains how to install the Whitespace Bundle for TextMate2.

1) mkdir -p ~/Library/Application\ Support/Avian/Bundles
2) cd ~/Library/Application\ Support/Avian/Bundles
3) git clone https://github.com/mads379/Whitespace.tmbundle.git
4) Open TextMate > Preferences
5) Create a Variable named 'Invalid' with a value of 'Red'(or whatever color you choose)
6) Restart TextMate

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Mounting VirtualBox shared folders on Ubuntu Server 18.04 LTS (Bionic Beaver)

This guide will walk you through the steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest.

Prerequisites

This guide assumes that you are using the following setup:

• Oracle VM VirtualBox version 6.0.10 with Extension Pack installed
• Microsoft Windows 7 SP1 as the host OS
• A fresh install of Ubuntu Server 18.04.2 LTS as the guest OS

You could still make this guide work with other setups (possibly with some modifications to the commands and whatnot).

kany

Rails 5 and ActionCable

Assumptions: The application already exists. You have two models article.rb and comment.rb. Articles have two attributes, title and text. Comments have two attributes, text and article_id. See these instructions if you need help getting started.

Routes

Assuming that you are nesting your :comments resources inside of :articles, mount ActionCable and make sure you have a root.

config/routes.rb

Rails.application.routes.draw do

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http://robots.thoughtbot.com/post/47202759358/using-gdb-to-inspect-a-running-ruby-process

That’s not a great thing to have to say, is it? However, I bet you’ve said it before and may not have immediately know why.

With liberal use of puts and maybe pry, you can figure out what a problem might be next time you run it, but sometimes you need to figure out what that problem is right now.

As it turns out, and I know this is a shocker, Ruby processes are just regular processes. They can be debugged with gdb.

Having recently had the need to find out why a job of mine was running particularly slowly, I found out about this lovely tool the hard way: frantic googling. I found some very useful functions for gdb in a blog post by Rasmus on Ruby callstacks.

kany

Deploy Facebooks' React VR TourSample to Heroku in 5 minutes or less

Step by step instructions for deploying react-vr/tree/master/Examples/TourSample to Heroku.

Demo

https://serene-retreat-76943.herokuapp.com/index.html

Shout-outs to:

1. Facebook for their VR framework React VR.

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Toggle Wireless Mode

This script will allow switching between managed and monitor mode for a wireless adapter.

Managed mode is the default wireless adapter mode.

Monitor mode allows monitoring all traffic received on a wireless channel and allows packets to be captured without having to associate with an access point.

Environment

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# resource - http://richardlog.com/post/12743073497/pretty-printing-json-and-xml-on-mac-osx

# Formatting XML
cat unformatted.xml | xmllint --format - > formatted.xml

# Formatting JSON
cat unformatted.json | python -m json.tool > formatted.json

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gem install less --no-ri --no-rdoc
gem install therubyracer --no-ri --no-rdoc

lessc app/assets/stylesheets/less/mobile/common/core.less > app/assets/stylesheets/css/mobile/core.css

1) delete associated css file(s) for modified less file(s) from public/assets/***.css
2) bundle exec rake assets:precompile

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# Use raw sql to calculate distance between latitude/longitude coordinates

# From the web
# - http://gis.stackexchange.com/questions/31628/find-points-within-a-distance-using-mysql
"SELECT
  id, (
    3959 * acos (
      cos ( radians(78.3232) )
      * cos( radians( lat ) )
      * cos( radians( lng ) - radians(65.3234) )