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Based on https://mudge.name/2019/11/12/using-a-raspberry-pi-for-time-machine/.

sudo apt install samba

lsblk

FORMAT

sudo mkfs -t ext4 /dev/sda

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First, set up Raspbian.

Install prereqs.

sudo apt-get install apparmor-utils apt-transport-https avahi-daemon ca-certificates curl dbus jq network-manager socat software-properties-common

Install docker.

curl -sSL https://get.docker.com | sh

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First, install Raspbian.

Install the Cisco IPsec VPN server (https://github.com/hwdsl2/setup-ipsec-vpn) using the command below.

$ wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh

Set up new VPN clients. https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/manage-users.md

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First, install Raspbian.

Configuring your sound card

This configuration works with HiFiBerry DACs and the Sabre ES9023 chip.

If you are using WiFi, turn off WiFi Power Management.

$ sudo iwconfig wlan0 power off

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sentence = 'Sometimes (when I nest them (my parentheticals) too much (like this (and this))) they get confusing.'

def closing_paren_index( string, opening_paren_index )
  depth = 1
  partial = string.slice opening_paren_index + 1..-1

  partial.each_char.with_index do |char, index|
    if char == '('
      depth += 1
    elsif char == ')'

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What are Element Queries?

• Also called container queries
• A way to change style based on element dimensions
• Good for reusable components
• They don't exist

The Problem with Element Queries

• Circular dependencies

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infile = ARGV[ 0 ]
words = File.readlines( infile )

# O(log n)

def rotation_index( array, lowest_so_far = nil, from = 0, to = nil )
  lowest_so_far ||= array.first.downcase
  to ||= array.size - 1

  if from > to

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Feature Branches

Start a branch for each new feature.

git checkout -b <branch>

Publish your branch and set up tracking.

git push -u origin 

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Download the latest Raspberry Pi OS Lite image from https://www.raspberrypi.com/software/operating-systems/ (2022-04-04 at the time of this writing).

Insert your microSD card. Use Raspberry Pi Imager to burn the image to your microSD card. Make to select "Set username and password" in the config before starting. Name the user pi and select your own password.

Ensure the disk is mounted again, then enable SSH.

$ touch /Volumes/boot/ssh

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# app/models/image.rb

class Image < ActiveRecord::Base

  belongs_to :term

  def serializable_hash(options = nil)
    hash = super
    hash.delete_if { |k, v| v.blank? }
    hash.delete('filename')