# config
<a name="greengrass-development-kit-cli-config"></a>

Use the `config` command in the AWS IoT Greengrass Development Kit Command-Line Interface (GDK CLI) to modify the configuration for the GDK in the configuration file, `gdk-config.json`.

**Topics**
+ [update](#greengrass-development-kit-cli-config-update)

## update
<a name="greengrass-development-kit-cli-config-update"></a>

Start an interactive prompt to modify fields within an existing GDK configuration file.

**Synopsis**  

```
$ gdk config update
    [--component]
```

**Arguments**  
+ `-c`, `--component` – To update component-related fields in the `gdk-config.json` file. This argument is required since it is the only option.

**Output**  
The following example shows the output produced when you run this command to configure a component.  

```
$ gdk config update --component
Current value of the REQUIRED component_name is (default: com.example.PythonHelloWorld): 
Current value of the REQUIRED author is (default: author): 
Current value of the REQUIRED version is (default: NEXT_PATCH): 
Do you want to change the build configurations? (y/n) 
Do you want to change the publish configurations? (y/n)
[2023-09-26 10:19:48] INFO - Config file has been updated. Exiting...
```