diff --git a/Duplicati/Library/AutoUpdater/Program.cs b/Duplicati/Library/AutoUpdater/Program.cs
index 4a9c2317c..748c1cf05 100644
--- a/Duplicati/Library/AutoUpdater/Program.cs
+++ b/Duplicati/Library/AutoUpdater/Program.cs
@@ -45,6 +45,8 @@ namespace Duplicati.Library.AutoUpdater
                 return 100;
             }
 
+            UpdaterManager.OnError += (ex) => Console.WriteLine("Error detected: {0}", ex);
+
             var cmd = args[0].ToLowerInvariant().Trim();
             switch (cmd)
             {
@@ -60,6 +62,17 @@ namespace Duplicati.Library.AutoUpdater
                         Console.WriteLine(string.Join(Environment.NewLine, versions.Select(x => string.Format(" {0} {1} ({2})", (x.Value.Version == UpdaterManager.SelfVersion.Version ? "*" : "-"), x.Value.Displayname, x.Value.Version))));
                         return 0;
                     }
+
+                case "verify":
+                    {
+                        var versions = UpdaterManager.FindInstalledVersions();
+                        var selfdir = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
+                        if (string.Equals(Library.Utility.Utility.AppendDirSeparator(selfdir), Library.Utility.Utility.AppendDirSeparator(UpdaterManager.InstalledBaseDir)))
+                            versions = versions.Union(new KeyValuePair<string, UpdateInfo>[] { new KeyValuePair<string, UpdateInfo>(selfdir, UpdaterManager.SelfVersion) });
+
+                        Console.WriteLine(string.Join(Environment.NewLine, versions.Select(x => string.Format(" {0} {1} ({2}): {3}", (x.Value.Version == UpdaterManager.SelfVersion.Version ? "*" : "-"), x.Value.Displayname, x.Value.Version, UpdaterManager.VerifyUnpackedFolder(x.Key, x.Value) ? "Valid" : "*** Modified ***"))));
+                        return 0;
+                    }
                 case "check":
                     {
                         var update = UpdaterManager.CheckForUpdate();
@@ -105,7 +118,7 @@ namespace Duplicati.Library.AutoUpdater
 
         private static void WriteUsage()
         {
-            Console.WriteLine("Usage:{0}\t{1}{2} [LIST|CHECK|INSTALL|HELP]", Environment.NewLine, Duplicati.Library.Utility.Utility.IsMono ? "mono " : "", System.IO.Path.GetFileName(System.Reflection.Assembly.GetExecutingAssembly().Location));
+            Console.WriteLine("Usage:{0}\t{1}{2} [LIST|VERIFY|CHECK|INSTALL|HELP]", Environment.NewLine, Duplicati.Library.Utility.Utility.IsMono ? "mono " : "", System.IO.Path.GetFileName(System.Reflection.Assembly.GetExecutingAssembly().Location));
             Console.WriteLine();
             Console.WriteLine("Environment variables:");
             Console.WriteLine();