./emqx_ctl data export命令不生效

[Huang-zhijie]

File: /zh_CN/advanced/data-import-and-export.md

我想在已经启动的实例中导出数据，但是我输入这行命令后并没有按照预期地将数据保存成json文件，而是提醒我emqx_ctl的用法 [xxxx@xxxxx bin]$ ./emqx_ctl export
Usage: emqx_ctl

mgmt list # List Applications
mgmt insert <AppId> <Name> # Add Application of REST API
mgmt update <AppId> # Update Application of REST API
mgmt lookup <AppId> # Get Application of REST API
mgmt delete <AppId> # Delete Application of REST API