uninstall_specific

# File lib/rubygems/commands/uninstall_command.rb, line 142
  def uninstall_specific
    deplist = Gem::DependencyList.new

    get_all_gem_names.uniq.each do |name|
      gem_specs = Gem::Specification.find_all_by_name(name)
      say("Gem '#{name}' is not installed") if gem_specs.empty?
      gem_specs.each do |spec|
        deplist.add spec
      end
    end

    deps = deplist.strongly_connected_components.flatten.reverse

    deps.map(&:name).uniq.each do |gem_name|
      begin
        Gem::Uninstaller.new(gem_name, options).uninstall
      rescue Gem::GemNotInHomeException => e
        spec = e.spec
        alert("In order to remove #{spec.name}, please execute:\n" +
              "\tgem uninstall #{spec.name} --install-dir=#{spec.installation_path}")
      end
    end
  end