> For the complete documentation index, see [llms.txt](https://docs.stackmate.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stackmate.io/commands/stackmate-preview.md).

# stackmate preview

The `stackmate preview` command shows the changes that will be applied to the stack after you've updated your configuration file

### Usage

```
stackmate preview <environment> [-c configuration.yml -d working-directory]
```

### Arguments

* `<environment>` The environment to preview the changes for

### Options

* `--configuration <file>, -c <file>` the configuration file to be used for this operation. By default `.stackmate/config.yml` is used
* `--directory <dir>, -d <dir>` the directory to use as a working one, where the [Output files](/guides/output-files.md) will be generated&#x20;