Index: lldb/include/lldb/Core/Debugger.h
===================================================================
--- lldb/include/lldb/Core/Debugger.h
+++ lldb/include/lldb/Core/Debugger.h
@@ -31,6 +31,7 @@
 #include "lldb/Utility/FileSpec.h"
 #include "lldb/Utility/Status.h"
 #include "lldb/Utility/UserID.h"
+#include "lldb/Utility/Diagnostics.h"
 #include "lldb/lldb-defines.h"
 #include "lldb/lldb-enumerations.h"
 #include "lldb/lldb-forward.h"
@@ -589,6 +590,7 @@
   lldb::ListenerSP m_forward_listener_sp;
   llvm::once_flag m_clear_once;
   lldb::TargetSP m_dummy_target_sp;
+  Diagnostics::CallbackID m_diagnostics_callback_id;
 
   // Events for m_sync_broadcaster
   enum {
Index: lldb/source/Core/Debugger.cpp
===================================================================
--- lldb/source/Core/Debugger.cpp
+++ lldb/source/Core/Debugger.cpp
@@ -44,7 +44,6 @@
 #include "lldb/Target/Thread.h"
 #include "lldb/Target/ThreadList.h"
 #include "lldb/Utility/AnsiTerminal.h"
-#include "lldb/Utility/Diagnostics.h"
 #include "lldb/Utility/Event.h"
 #include "lldb/Utility/LLDBLog.h"
 #include "lldb/Utility/Listener.h"
@@ -828,6 +827,22 @@
   if (!GetOutputFile().GetIsTerminalWithColors())
     SetUseColor(false);
 
+  if (Diagnostics::Enabled()) {
+    m_diagnostics_callback_id = Diagnostics::Instance().AddCallback(
+        [this](const FileSpec &dir) -> llvm::Error {
+          for (auto &entry : m_stream_handlers) {
+            llvm::StringRef log_path = entry.first();
+            llvm::StringRef file_name = llvm::sys::path::filename(log_path);
+            FileSpec destination = dir.CopyByAppendingPathComponent(file_name);
+            std::error_code ec =
+                llvm::sys::fs::copy_file(entry.first(), destination.GetPath());
+            if (ec)
+              return llvm::errorCodeToError(ec);
+          }
+          return llvm::Error::success();
+        });
+  }
+
 #if defined(_WIN32) && defined(ENABLE_VIRTUAL_TERMINAL_PROCESSING)
   // Enabling use of ANSI color codes because LLDB is using them to highlight
   // text.
@@ -866,6 +881,9 @@
     GetInputFile().Close();
 
     m_command_interpreter_up->Clear();
+
+    if (Diagnostics::Enabled())
+      Diagnostics::Instance().RemoveCallback(m_diagnostics_callback_id);
   });
 }
 
Index: lldb/test/Shell/Diagnostics/Inputs/TestCopyLogs.in
===================================================================
--- /dev/null
+++ lldb/test/Shell/Diagnostics/Inputs/TestCopyLogs.in
@@ -0,0 +1 @@
+command alias logcommands log enable lldb commands
Index: lldb/test/Shell/Diagnostics/TestCopyLogs.test
===================================================================
--- /dev/null
+++ lldb/test/Shell/Diagnostics/TestCopyLogs.test
@@ -0,0 +1,7 @@
+# RUN: rm -rf %t
+# RUN: mkdir -p %t
+
+# RUN: %lldb -s %S/Inputs/TestCopyLogs.in -o 'logcommands -f %t/commands.log' -o 'diagnostics dump -d %t/diags'
+
+# RUN: cat %t/diags/commands.log | FileCheck %s
+# CHECK: Processing command: diagnostics dump