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source 'https://rubygems.org'

gem 'rpi_gpio', '~> 0.3.3'
gem 'slack-ruby-client', '~> 0.10.0'

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To observer any notification

center.addObserver(forName: nil, object: nil, queue: nil) { (note) in
  print("note: \(note)")
}

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Manually setting the date and time

$ sudo date MMDDhhmmYYYY

MM - Two digit month number
DD - Two digit date
hh - Two digit 24 hour system hour
mm - Two digit minute
YYYY - Four digit year code

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Execute an interactive bash shell on the container

docker exec -it app-accounting bash

Remove unused volumes

$ docker volume rm (docker volume ls -q -f dangling=true)

Remove all images

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Semantic Commit Messages

https://seesparkbox.com/foundry/semantic_commit_messages

chore: add Oyster build script
docs: explain hat wobble
feat: add beta sequence
fix: remove broken confirmation message
refactor: share logic between 4d3d3d3 and flarhgunnstow

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Series #1 in Demystificationising™ the web

DNS (Domain Name System)

Links

• https://medium.com/@maneesha.wijesinghe1/what-happens-when-you-type-an-url-in-the-browser-and-press-enter-bb0aa2449c1a
• https://webhostinggeeks.com/guides/dns/
• https://github.com/alex/what-happens-when
• https://dev.to/antonfrattaroli/what-happens-when-you-type-googlecom-into-a-browser-and-press-enter-39g8

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Start new session with name

tmux new -s mysession

Attach to existing session

tmux a -t mysession

Attach to last session

tmux a

List sessions

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Helpful JS testing tips

JEST Mocking

Spotify.validateTrack.mockImplementation(trackMock)
Decorator.parse.mockResolvedValue('unifiedMessage')
User.findOneAndUpdate.mockRejectedValue(new Error('bang'))

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Setup

https://www.digitalocean.com/community/tutorials/how-to-install-mongodb-on-ubuntu-18-04

Permissions

https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-mongodb-on-ubuntu-16-04#part-two-securing-mongodb

Create admin user

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example of chopping massive.csv into smaller mini.csv files of 1000 lines

$ brew install coreutils
$ gsplit -dl 10000 --additional-suffix=.csv massive.csv mini
$
$ ls -A1
mini00.csv
mini01.csv
mini02.csv