From 07bad5df15a143d921f9148c3c903106bb37f3b0 Mon Sep 17 00:00:00 2001
From: Yaojun Zheng <hsxfjames@gmail.com>
Date: Sun, 18 Feb 2018 22:06:15 +0800
Subject: [PATCH] Output help information on unknown CLI commands

---
 packages/@vue/cli/bin/vue.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/@vue/cli/bin/vue.js b/packages/@vue/cli/bin/vue.js
index 550534546a..83e0053193 100755
--- a/packages/@vue/cli/bin/vue.js
+++ b/packages/@vue/cli/bin/vue.js
@@ -87,6 +87,15 @@ program
     loadCommand('init', '@vue/cli-init')
   })
 
+// output help information on unknown commands
+program
+  .arguments('<command>')
+  .action((cmd) => {
+    program.outputHelp()
+    console.log(`  ` + chalk.red(`Unknown command ${chalk.yellow(cmd)}.`))
+    console.log()
+  })
+
 // add some useful info on help
 program.on('--help', () => {
   console.log()