class Gem::Commands::UnpackCommand

def initialize
  require 'fileutils'
  super 'unpack', 'Unpack an installed gem to the current directory',
        :version => Gem::Requirement.default,
        :target  => Dir.pwd
  add_option('--target=DIR',
             'target directory for unpacking') do |value, options|
    options[:target] = value
  end
  add_option('--spec', 'unpack the gem specification') do |value, options|
    options[:spec] = true
  end
  add_security_option
  add_version_option
end