fix print bug

Author: shadowabi

cmd/root.go

@@ -42,6 +42,7 @@ var logLevel string
 func init() {
 	RootCmd.PersistentFlags().StringVar(&logLevel, "logLevel", "info", "设置日志等级 (Set log level) [trace|debug|info|warn|error|fatal|panic]")
 	RootCmd.CompletionOptions.DisableDefaultCmd = true
+	RootCmd.SetHelpFunc(customHelpFunc)
 	RootCmd.PersistentFlags().StringVarP(&define.File, "file", "f", "", "从文件中读取目标地址 (Input FILENAME)")
 	RootCmd.PersistentFlags().StringVarP(&define.Url, "url", "u", "", "输入目标地址 (Input [ip|domain|url])")
 	RootCmd.PersistentFlags().IntVarP(&define.TimeOut, "timeout", "t", 15, "输入每个 http 请求的超时时间 (Enter the timeout period for every http request)")
@@ -62,3 +63,7 @@ func Execute() {
 		os.Exit(1)
 	}
 }
+
+func customHelpFunc(cmd *cobra.Command, args []string) {
+	cmd.Usage()
+}