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You need to do this if you try this command:

ssh -T [email protected]

and you get something that says

[email protected]: Permission denied (public key).

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namespace :optimization do
  desc "Provide DB vacuum for production environment"
  task :vacuum => :environment do
    begin
      tables = ActiveRecord::Base.connection.tables
      tables.each do |table|
        ActiveRecord::Base.connection.execute("VACUUM FULL ANALYZE #{table};")
      end
    rescue Exception => exc
      Rails.logger.error("Database VACUUM error: #{exc.message}")

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# credit: http://stackoverflow.com/questions/4514988/rails-is-there-away-to-get-the-date-object-that-is-the-closest-monday-to-today
# docs: http://www.ruby-doc.org/stdlib-1.9.3/libdoc/date/rdoc/Date.html#method-c-commercial

# Find the next Monday
Date.commercial(Date.today.year, 1+Date.today.cweek, 1)

# Find the nearest Monday
Date.commercial(Date.today.year, Date.today.cwday.modulo(4)+Date.today.cweek, 1)

# Date of writing was: 2013-12-03

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# FOR BUSY JOBS
# take the process_id from the /busy page in sidekiq and kill the longest running one.
workers = Sidekiq::Workers.new
workers.each do |process_id, thread_id, work|
  process = Sidekiq::Process.new('identity' => process_id)
  process.stop! if process_id == 'integration.3:4:71d1d7f4ef5a'
end

# FOR SCHEDULED JOBS
# you need to know the jid to make this happen

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class DateRangeSplitter
  include Enumerable

  def initialize(date_from, date_to, max_days, end_inclusive: true)
    @date_from = date_from
    @date_to   = date_to
    @max_days  = max_days
    @end_inclusive = end_inclusive
    generate_split_dates
  end

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[email protected]:~$ sudo dd bs=1m if=/Users/jamesmead/Downloads/2015-02-16-raspbian-wheezy.img of=/dev/disk2

pi@raspberrypi ~ $ sudo raspi-config
# Choose option 1 to "Expand Filesystem" - Ensures that all of the SD card storage is available to the OS
# Choose Finish & reboot

pi@raspberrypi ~ $ sudo apt-get update

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module ChargebeeFetcher
  class Subscription
    attr_reader :response
    delegate :has_card?, to: :customer, allow_nil: true
    delegate :card_expired?, :card_will_expire_soon?, to: :card

    def initialize(response)
      @response = response
    end

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Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

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/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

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Copy whole content of the file  gg"+yG

Файл настройки: ~/.vimrc
Можно редактировать файлы через сеть, например
:e <scp|ftp|ftps>://user@host/path/to/the/file.txt
:Ex или :e ./ - файловый менеджер

== Основы ==
hjkl                      перемещение в разные стороны
i                         режим вставки