```ruby
cask :v1 => 'virtualbox-beta' do
  version '5.0.0_RC1-100731'
  sha256 '9cd0923966b83a0447b1bc4ea397971f3b1908ec974bb517637cf1e3a975573b'

  url "http://download.virtualbox.org/virtualbox/#{version.split('-')[0]}/VirtualBox-#{version}-OSX.dmg"
  homepage 'http://www.virtualbox.org'
  license :gpl

  pkg 'VirtualBox.pkg'
  uninstall :script => { :executable => 'VirtualBox_Uninstall.tool', :args => %w[--unattended] }
end
```

Upgrade Virtualbox Beta to RC2-101271 and add tag,binary,pkgutil
user
```ruby
cask :v1 => 'virtualbox-beta' do
  version '5.0.0_RC2-101271'
  sha256 '6ab15a281b30d60cf245aad3ef66deb72e87deacbcbfc660dfbbc5b8e7c8543d'

  url "http://download.virtualbox.org/virtualbox/#{version.split('-')[0]}/VirtualBox-#{version}-OSX.dmg"
  homepage 'http://www.virtualbox.org'
  license :gpl
  tags :vendor => 'Oracle'

  pkg 'VirtualBox.pkg'
  binary '/Applications/VirtualBox.app/Contents/MacOS/VBoxManage'
  binary '/Applications/VirtualBox.app/Contents/MacOS/VBoxHeadless'

  uninstall :script => { :executable => 'VirtualBox_Uninstall.tool', :args => %w[--unattended] },
            :pkgutil => 'org.virtualbox.pkg.*'
end
```
assistant