diff --git a/.gitignore b/.gitignore
index c433cde..a18ca26 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,5 @@ tmp
 *.o
 *.a
 mkmf.log
+Vagrantfile
+.vagrant/
diff --git a/Gemfile b/Gemfile
index 7fda0d6..078b116 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,5 @@
 source 'https://rubygems.org'
 
-gemspec
-
 group :development do
   gem 'vagrant', git: 'https://github.com/mitchellh/vagrant.git'
 end
diff --git a/lib/command.rb b/lib/command.rb
index 2b6038b..fa03493 100644
--- a/lib/command.rb
+++ b/lib/command.rb
@@ -1,8 +1,14 @@
 module VagrantPlugins
   module GuestIP
     class Command < Vagrant.plugin(2, :command)
+      def self.synopsis
+        'outputs IP address of a guest machine'
+      end
+
       def execute
-        puts "Hello!"
+        with_target_vms(nil, {:single_target=>true}) do |machine|
+          puts machine.guest.capability(:read_ip_address)
+        end
       end
     end
   end