# write(toFile:atomically:) Writes the data object’s bytes to the file specified by a given path. ``` func write(toFile path: String, atomically useAuxiliaryFile: Bool) -> Bool ``` ## Parameters `path` The location to which to write the receiver’s bytes. If `path` contains a tilde (~) character, you must expand it with [`expandingTildeInPath`](/documentation/Foundation/NSString/expandingTildeInPath) before invoking this method. `useAuxiliaryFile` If , the data is written to a backup file, and then—assuming no errors occur—the backup file is renamed to the name specified by `path`; otherwise, the data is written directly to `path`. ## Return Value if the operation succeeds, otherwise . ## Discussion This method may not be appropriate when writing to publicly accessible files. To securely write data to a public location, use [`FileHandle`](/documentation/Foundation/FileHandle) instead. For more information, see [Securing File Operations](https://developer.apple.com/library/archive/documentation/Security/Conceptual/SecureCodingGuide/Articles/RaceConditions.html#//apple_ref/doc/uid/TP40002585-SW9) in [Secure Coding Guide](https://developer.apple.com/library/archive/documentation/Security/Conceptual/SecureCodingGuide/Introduction.html#//apple_ref/doc/uid/TP40002415). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)