Index: lldb/source/Core/Debugger.cpp
===================================================================
--- lldb/source/Core/Debugger.cpp
+++ lldb/source/Core/Debugger.cpp
@@ -828,6 +828,22 @@
   if (!GetOutputFile().GetIsTerminalWithColors())
     SetUseColor(false);
 
+  if (Diagnostics::Enabled()) {
+    Diagnostics::Instance().AddCallback(
+        [&](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.
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