---
title: argumentDomain
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/userdefaults/argumentdomain
---

# argumentDomain

The identifier for the domain that contains command-line settings.

## Declaration

```swift
class let argumentDomain: String
```

## Discussion

Discussion When someone launches your app from Xcode or the command-line, they can override setting values using command-line arguments. The defaults system stores those overrides in this domain, which is volatile and resets with each app launch. Values in this domain override most other domains, including your app-specific settings. To specify custom settings from the command line, add the -default parameter to your command-line invocation followed by a key=value string with the key and value you want to set.

## See Also

### Getting the domain names

- [globalDomain](foundation/userdefaults/globaldomain.md)
- [registrationDomain](foundation/userdefaults/registrationdomain.md)
- [volatileDomainNames](foundation/userdefaults/volatiledomainnames.md)