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OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

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gifify() {
  if [[ -n "$1" ]]; then
    if [[ $2 == '--good' ]]; then
      ffmpeg -i $1 -r 10 -vcodec png out-static-%05d.png
      time convert -verbose +dither -layers Optimize -resize 600x600\> out-static*.png  GIF:- | gifsicle --colors 128 --delay=5 --loop --optimize=3 --multifile - > $1.gif
      rm out-static*.png
    else
      ffmpeg -i $1 -s 600x400 -pix_fmt rgb24 -r 10 -f gif - | gifsicle --optimize=3 --delay=3 > $1.gif
    fi
  else

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require 'pathname'
require 'fileutils'

Pathname.glob("content/articles/**/index.txt").entries.each do |path|
  new_filename = path.to_s.split('/')[2..5].join('-')
  new_filename = "#{new_filename}.html.markdown"

  FileUtils.cp(path, new_filename)
end

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Add a new disk to a RAID 5 array

Create a new partition

Create new primary partition

fdisk /dev/sdf

Set partition to Linux RAID Autodetect which is fd

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class NullObject < BasicObject
  def method_missing(*)
    self
  end

  def respond_to_missing?(name)
    true
  end
end

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Purchase = Struct.new(:description, :price)

DATA = [
  Purchase.new("Walkman", "1.25"),
  Purchase.new("Mini-disc player", "2.57"),
  Purchase.new("Record player", "3.54")
]

require 'logger'

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class User
  def name
    # ...from the database
    "Fred"
  end

  def self.find(user_id)
    user_id == 123 ? self.new : nil
  end
end

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MySQL basics

Dump the database

mysqldump -u root -p <database> > /path/to/file.sql

Restore the database

mysql -u root -p <database> < /path/to/file.sql

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A/B Testing tools

• Split

• Optimizely

• Google Analytics has Website Optimiser now built in

• Visual Website Optimizer

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class Foo
  def bar(arg)
    arg.call
  end
end

class X
  def call
    "Normal class"
  end