---
title: posixUID
framework: Collaboration
role: symbol
role_heading: Instance Property
platforms: [macOS 10.5+]
path: collaboration/cbuseridentity/posixuid
---

# posixUID

Returns the POSIX UID of the identity.

## Declaration

```swift
var posixUID: uid_t { get }
```

## Return Value

Return Value The POSIX UID of the identity.

## Discussion

Discussion The POSIX UID is a integer that can identify a user within an identity authority. UIDs are not guaranteed to be unique within an identity authority.

## See Also

### Using UIDs

- [init(posixUID:authority:)](collaboration/cbuseridentity/init(posixuid:authority:).md)