From 635b056e03a2ba4c2909402c3d43935401debc38 Mon Sep 17 00:00:00 2001
From: "Zaiming (Stone) Shi" <zmstone@gmail.com>
Date: Wed, 12 Jan 2022 08:18:44 +0100
Subject: [PATCH] fix(bin/emqx): print usage when no command given

---
 bin/emqx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bin/emqx b/bin/emqx
index 39a62b4b5..dff9ac549 100755
--- a/bin/emqx
+++ b/bin/emqx
@@ -199,6 +199,11 @@ usage() {
 
 COMMAND="${1:-}"
 
+if [ -z "$COMMAND" ]; then
+    usage 'nil'
+    exit 1
+fi
+
 if [ "${2:-}" = 'help' ]; then
     ## 'ctl' command has its own usage info
     if [ "$COMMAND" != 'ctl' ]; then