diff --git a/examples/injectlaunch.lua b/examples/injectlaunch.lua
new file mode 100644
index 00000000..4a0028c0
--- /dev/null
+++ b/examples/injectlaunch.lua
@@ -0,0 +1,19 @@
+if not _P then
+	print[[
+This file is examples to show how to inject code into lua service.
+It is used to inject into launcher service to change the command.LAUNCH to command.LOGLAUNCH.
+telnet the debug_console service (nc 127.0.0.1 8000), and run:
+inject 3 examples/injectlaunch.lua	-- 3 means launcher service
+]]
+	return
+end
+local command = _P.lua.command
+
+if command.RAWLAUNCH then
+	command.LAUNCH, command.RAWLAUNCH = command.RAWLAUNCH
+	print "restore command.LAUNCH"
+else
+	command.RAWLAUNCH = command.LAUNCH
+	command.LAUNCH = command.LOGLAUNCH
+	print "replace command.LAUNCH"
+end