diff --git a/lldb/source/Commands/CommandObjectUnalias.cpp b/lldb/source/Commands/CommandObjectUnalias.cpp
new file mode 100644
index 0000000..6c2f508
--- /dev/null
+++ b/lldb/source/Commands/CommandObjectUnalias.cpp
@@ -0,0 +1,87 @@
+//===-- CommandObjectUnalias.cpp --------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CommandObjectUnalias.h"
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+// Project includes
+#include "lldb/Interpreter/CommandInterpreter.h"
+#include "lldb/Interpreter/CommandReturnObject.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+//-------------------------------------------------------------------------
+// CommandObjectUnalias
+//-------------------------------------------------------------------------
+
+CommandObjectUnalias::CommandObjectUnalias () :
+    CommandObject ("unalias",
+                     "Allows the user to remove/delete a user-defined command abbreviation.",
+                     "unalias <alias-name-to-be-removed>")
+{
+}
+
+CommandObjectUnalias::~CommandObjectUnalias()
+{
+}
+
+
+bool
+CommandObjectUnalias::Execute (Args& args, CommandContext *context, CommandInterpreter *interpreter,
+                               CommandReturnObject &result)
+{
+    CommandObject::CommandMap::iterator pos;
+    CommandObject *cmd_obj;
+
+    if (args.GetArgumentCount() != 0)
+    {
+        const char *command_name = args.GetArgumentAtIndex(0);
+        cmd_obj = interpreter->GetCommandObject(command_name);
+        if (cmd_obj)
+        {
+            if (interpreter->CommandExists (command_name))
+            {
+                result.AppendErrorWithFormat ("'%s' is a permanent debugger command and cannot be removed.\n",
+                                              command_name);
+                result.SetStatus (eReturnStatusFailed);
+            }
+            else
+            {
+
+                if (interpreter->RemoveAlias (command_name) == false)
+                {
+                    if (interpreter->AliasExists (command_name))
+                        result.AppendErrorWithFormat ("Error occurred while attempting to unalias '%s'.\n", command_name);
+                    else
+                        result.AppendErrorWithFormat ("'%s' is not an existing alias.\n", command_name);
+                    result.SetStatus (eReturnStatusFailed);
+                }
+                else
+                    result.SetStatus (eReturnStatusSuccessFinishNoResult);
+            }
+        }
+        else
+        {
+            result.AppendErrorWithFormat ("'%s' is not a known command.\nTry 'help' to see a current list of commands.\n",
+                                         command_name);
+            result.SetStatus (eReturnStatusFailed);
+        }
+    }
+    else
+    {
+        result.AppendError ("must call 'unalias' with a valid alias");
+        result.SetStatus (eReturnStatusFailed);
+    }
+
+    return result.Succeeded();
+}
+