diff --git a/core/Command/User/Inactive.php b/core/Command/User/Inactive.php
new file mode 100644
index 000000000000..5ad91df08e78
--- /dev/null
+++ b/core/Command/User/Inactive.php
@@ -0,0 +1,81 @@
+<?php
+/**
+ * @author Tom Needham <tom@owncloud.com>
+ *
+ * @copyright Copyright (c) 2017, ownCloud GmbH
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Core\Command\User;
+
+use OC\Core\Command\Base;
+use OCP\IUser;
+use OCP\IUserManager;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Inactive extends Base {
+	/** @var \OCP\IUserManager */
+	protected $userManager;
+
+	/**
+	 * @param IUserManager $userManager
+	 */
+	public function __construct(IUserManager $userManager) {
+		parent::__construct();
+		$this->userManager = $userManager;
+	}
+
+	protected function configure() {
+		$this
+			->setName('user:inactive')
+			->setDescription('reports users who are known to owncloud, but have not logged in for a certain number of days')
+			->addArgument(
+				'days',
+				InputArgument::REQUIRED,
+				'Integer number of days that the user has not logged in since'
+			);
+		parent::configure();
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output) {
+		$days = $input->getArgument('days');
+		if(!is_int($days) || $days < 1) {
+			throw new InvalidArgumentException('Days must be integer and above zero');
+		}
+
+		$now = time();
+
+		$inactive = [];
+		$this->userManager->callForSeenUsers(function(IUser $user) use (&$inactive, $days, $now) {
+			$lastLogin = $user->getLastLogin();
+			// Difference between now and last login, into days, and rounded down
+			$daysSinceLastLogin = floor(($now - $lastLogin) / (60*60*24));
+			if($daysSinceLastLogin >= $days) {
+				$inactive[] = [
+					'uid' => $user->getUID(),
+					'displayName' => $user->getDisplayName(),
+					'inactiveSinceDays' => $daysSinceLastLogin
+				];
+			}
+		});
+
+		$this->writeArrayInOutputFormat($input, $output, $inactive);
+
+	}
+}
diff --git a/core/register_command.php b/core/register_command.php
index 5a3605212e9c..3fb7138f48a2 100644
--- a/core/register_command.php
+++ b/core/register_command.php
@@ -144,6 +144,7 @@
 	$application->add(new OC\Core\Command\User\ResetPassword(\OC::$server->getUserManager()));
 	$application->add(new OC\Core\Command\User\Setting(\OC::$server->getUserManager(), \OC::$server->getConfig(), \OC::$server->getDatabaseConnection()));
 	$application->add(new OC\Core\Command\User\SyncBackend(\OC::$server->getAccountMapper(), \OC::$server->getConfig(), \OC::$server->getUserManager(), \OC::$server->getLogger()));
+	$application->add(new \OC\Core\Command\User\Inactive(\OC::$server->getUserManager()));
 
 	$application->add(new OC\Core\Command\Group\Add(\OC::$server->getGroupManager()));
 	$application->add(new OC\Core\Command\Group\Delete(\OC::$server->getGroupManager()));
diff --git a/tests/Core/Command/User/InactiveTest.php b/tests/Core/Command/User/InactiveTest.php
new file mode 100644
index 000000000000..342179646c49
--- /dev/null
+++ b/tests/Core/Command/User/InactiveTest.php
@@ -0,0 +1,135 @@
+<?php
+/**
+ * @author Tom Needham <tom@owncloud.com>
+ *
+ * @copyright Copyright (c) 2017, ownCloud GmbH.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace Tests\Core\Command\User;
+
+use OC\Core\Command\Base;
+use OC\Core\Command\User\Inactive;
+use OCP\IUser;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
+use Test\TestCase;
+
+class InactiveTest extends TestCase {
+
+	/** @var \PHPUnit_Framework_MockObject_MockObject */
+	protected $userManager;
+	/** @var \PHPUnit_Framework_MockObject_MockObject */
+	protected $consoleInput;
+	/** @var \PHPUnit_Framework_MockObject_MockObject */
+	protected $consoleOutput;
+
+	/** @var \Symfony\Component\Console\Command\Command */
+	protected $command;
+
+	protected function setUp() {
+		parent::setUp();
+
+		$userManager = $this->userManager = $this->getMockBuilder('OCP\IUserManager')
+			->disableOriginalConstructor()
+			->getMock();
+		$this->consoleInput = $this->createMock('Symfony\Component\Console\Input\InputInterface');
+		$this->consoleOutput = $this->createMock('Symfony\Component\Console\Output\OutputInterface');
+
+		/** @var \OCP\IUserManager $userManager */
+		$this->command = new Inactive($userManager);
+	}
+
+	public function invalidDays() {
+		return [
+			[0],
+			['test'],
+			[-1]
+		];
+	}
+
+	/**
+	 * @dataProvider invalidDays
+	 */
+	public function testWithInvalidDays($days) {
+		$this->consoleInput->expects($this->once())
+			->method('getArgument')
+			->with('days')
+			->willReturn($days);
+
+		$this->expectException(InvalidArgumentException::class);
+
+		self::invokePrivate($this->command, 'execute', [$this->consoleInput, $this->consoleOutput]);
+	}
+	
+	protected function dummyUser($lastLogin) {
+		$user = $this->createMock(IUser::class);
+		$user->expects($this->once())
+			->method('getLastLogin')
+			->willReturn($lastLogin);
+		
+		return $user;
+	}
+
+	public function validDays() {
+		return [
+			'no users' => [[], 10, 0],
+			'1 recent user, excluded' => [[$this->dummyUser(time()-2*24*60*60)], 10, 0],
+			'1 recent user, included' => [[$this->dummyUser(time()-2*24*60*60)], 1, 1],
+			'2 users 1 includd' => [
+				[
+					$this->dummyUser(time()-5*24*60*60),
+					$this->dummyUser(time()-10*24*60*60)
+				], 7, 1],
+		];
+	}
+
+	/**
+	 * @dataProvider validDays
+	 *
+	 * @param $users
+	 * @param $days
+	 * @param $expectedCount
+	 */
+	public function testWithValidDays($users, $days, $expectedCount) {
+		$this->consoleInput->expects($this->once())
+			->method('getArgument')
+			->with('days')
+			->willReturn($days);
+
+		// Work with json output
+		$this->consoleInput->expects($this->once())
+			->method('getOption')
+			->with('output')
+			->willReturn(Base::OUTPUT_FORMAT_JSON);
+
+		$this->userManager->expects($this->once())
+			->method('callForSeenUsers')
+			->willReturnCallback(function($callback) use ($users, $expectedCount) {
+				foreach($users as $user) {
+					$callback($user);
+				}
+			});
+
+		$this->consoleOutput->expects($this->once())
+			->method('writeLn')
+			->with($this->callback(function($output) use ($expectedCount) {
+				return self::isJson($output) && count(json_decode($output)) === $expectedCount;
+			}));
+
+		self::invokePrivate($this->command, 'execute', [$this->consoleInput, $this->consoleOutput]);
+	}
+
+}