diff --git a/src/Composer/Command/DebugPackagesCommand.php b/src/Composer/Command/DebugPackagesCommand.php
deleted file mode 100644
index e3d196466..000000000
--- a/src/Composer/Command/DebugPackagesCommand.php
+++ /dev/null
@@ -1,90 +0,0 @@
-<?php
-
-/*
- * This file is part of Composer.
- *
- * (c) Nils Adermann <naderman@naderman.de>
- *     Jordi Boggiano <j.boggiano@seld.be>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Composer\Command;
-
-use Composer\Autoload\AutoloadGenerator;
-use Composer\DependencyResolver;
-use Composer\DependencyResolver\Pool;
-use Composer\DependencyResolver\Request;
-use Composer\DependencyResolver\Operation;
-use Composer\Package\LinkConstraint\VersionConstraint;
-use Composer\Repository\CompositeRepository;
-use Composer\Repository\PlatformRepository;
-use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Input\InputOption;
-use Symfony\Component\Console\Output\OutputInterface;
-
-/**
- * @author Jordi Boggiano <j.boggiano@seld.be>
- */
-class DebugPackagesCommand extends Command
-{
-    protected function configure()
-    {
-        $this
-            ->setName('debug:packages')
-            ->setDescription('Lists all existing packages and their version')
-            ->setDefinition(array(
-                new InputOption('local', null, InputOption::VALUE_NONE, 'list locally installed packages only'),
-                new InputOption('platform', null, InputOption::VALUE_NONE, 'list platform packages only'),
-            ))
-            ->setHelp(<<<EOT
-<info>php composer.phar debug:packages</info>
-
-EOT
-            )
-        ;
-    }
-
-    protected function execute(InputInterface $input, OutputInterface $output)
-    {
-        $composer = $this->getComposer();
-
-        // create local repo, this contains all packages that are installed in the local project
-        $localRepo = $composer->getRepositoryManager()->getLocalRepository();
-        // create installed repo, this contains all local packages + platform packages (php & extensions)
-        $installedRepo = new CompositeRepository(array($localRepo, new PlatformRepository()));
-
-        if ($input->getOption('local')) {
-            foreach ($localRepo->getPackages() as $package) {
-                $output->writeln('<info>local:</info> ' . $package->getPrettyName() . ' ' . $package->getPrettyVersion() . '<comment> (' . $package->getVersion() . ')</comment>');
-            }
-
-            return;
-        }
-
-        if ($input->getOption('platform')) {
-            $repos = array_diff($installedRepo->getPackages(), $localRepo->getPackages());
-            foreach ($repos as $package) {
-                $output->writeln('<info>plattform:</info> ' . $package->getPrettyName() . ' ' . $package->getPrettyVersion() . '<comment> (' . $package->getVersion() . ')</comment>');
-            }
-
-            return;
-        }
-
-        foreach ($installedRepo->getPackages() as $package) {
-            if ($localRepo->hasPackage($package)) {
-                $output->writeln('<info>installed:</info> ' . $package->getPrettyName() . ' ' . $package->getPrettyVersion() . '<comment> (' . $package->getVersion() . ')</comment>');
-            } else {
-                $output->writeln('<info>platform:</info> ' . $package->getPrettyName() . ' ' . $package->getPrettyVersion() . '<comment> (' . $package->getName() . ' ' . $package->getVersion() . ')</comment>');
-            }
-        }
-
-        foreach ($composer->getRepositoryManager()->getRepositories() as $repository) {
-            foreach ($repository->getPackages() as $package) {
-                $output->writeln('<comment>available:</comment> ' . $package->getPrettyName() . ' ' . $package->getPrettyVersion() . '<comment> (' . $package->getName() . ' ' . $package->getVersion() . ')</comment>');
-            }
-        }
-    }
-
-}
\ No newline at end of file
diff --git a/src/Composer/Command/ShowCommand.php b/src/Composer/Command/ShowCommand.php
index a860a83af..4450966b3 100644
--- a/src/Composer/Command/ShowCommand.php
+++ b/src/Composer/Command/ShowCommand.php
@@ -16,6 +16,7 @@ use Composer\Composer;
 use Composer\Package\PackageInterface;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Composer\Repository\CompositeRepository;
 use Composer\Repository\PlatformRepository;
@@ -32,14 +33,16 @@ class ShowCommand extends Command
     {
         $this
             ->setName('show')
-            ->setDescription('Show package details')
+            ->setDescription('Show information about packages')
             ->setDefinition(array(
-                new InputArgument('package', InputArgument::REQUIRED, 'the package to inspect'),
-                new InputArgument('version', InputArgument::OPTIONAL, 'the version'),
+                new InputArgument('package', InputArgument::OPTIONAL, 'Package to inspect'),
+                new InputArgument('version', InputArgument::OPTIONAL, 'Version to inspect'),
+                new InputOption('installed', null, InputOption::VALUE_NONE, 'List installed packages only'),
+                new InputOption('platform', null, InputOption::VALUE_NONE, 'List platform packages only'),
             ))
             ->setHelp(<<<EOT
-The show command displays detailed information about a package
-<info>php composer.phar show composer/composer master-dev</info>
+The show command displays detailed information about a package, or
+lists all packages available.
 
 EOT
             )
@@ -48,25 +51,48 @@ EOT
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
-        if ($composer = $this->getComposer(false)) {
+        // init repos
+        $platformRepo = new PlatformRepository;
+        if ($input->getOption('platform')) {
+            $repos = $installedRepo = $platformRepo;
+        } elseif ($input->getOption('installed')) {
+            $composer = $this->getComposer();
+            $repos = $installedRepo = $composer->getRepositoryManager()->getLocalRepository();
+        } elseif ($composer = $this->getComposer(false)) {
             $localRepo = $composer->getRepositoryManager()->getLocalRepository();
-            $installedRepo = new CompositeRepository(array($localRepo, new PlatformRepository()));
+            $installedRepo = new CompositeRepository(array($localRepo, $platformRepo));
             $repos = new CompositeRepository(array_merge(array($installedRepo), $composer->getRepositoryManager()->getRepositories()));
         } else {
             $output->writeln('No composer.json found in the current directory, showing packages from packagist.org');
-            $installedRepo = new PlatformRepository;
+            $installedRepo = $platformRepo;
             $repos = new CompositeRepository(array($installedRepo, new ComposerRepository(array('url' => 'http://packagist.org'))));
         }
 
-        $package = $this->getPackage($input, $output, $installedRepo, $repos);
-        if (!$package) {
-            throw new \InvalidArgumentException('no package found');
+        // show single package or single version
+        if ($input->getArgument('package')) {
+            $package = $this->getPackage($input, $output, $installedRepo, $repos);
+            if (!$package) {
+                throw new \InvalidArgumentException('Package '.$input->getArgument('package').' not found');
+            }
+
+            $this->printMeta($input, $output, $package, $installedRepo, $repos);
+            $this->printLinks($input, $output, $package, 'requires');
+            $this->printLinks($input, $output, $package, 'recommends');
+            $this->printLinks($input, $output, $package, 'replaces');
+            return;
         }
 
-        $this->printMeta($input, $output, $package, $installedRepo, $repos);
-        $this->printLinks($input, $output, $package, 'requires');
-        $this->printLinks($input, $output, $package, 'recommends');
-        $this->printLinks($input, $output, $package, 'replaces');
+        // list packages
+        foreach ($repos->getPackages() as $package) {
+            if ($platformRepo->hasPackage($package)) {
+                $type = '<info>platform: </info> ';
+            } elseif ($installedRepo->hasPackage($package)) {
+                $type = '<info>installed:</info> ';
+            } else {
+                $type = '<comment>available:</comment> ';
+            }
+            $output->writeln($type . ' ' . $package->getPrettyName() . ' ' . $package->getPrettyVersion() . '<comment> (' . $package->getVersion() . ')</comment>');
+        }
     }
 
     /**