renameSync abstract method

FileSystemEntity renameSync(String newPath)

Synchronously renames this file system entity. Returns a FileSystemEntity instance for the renamed entity.

If newPath identifies an existing entity of the same type, that entity is replaced. If newPath identifies an existing entity of a different type, the operation fails and an exception is thrown.

Source

FileSystemEntity renameSync(String newPath);

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https://api.dartlang.org/stable/1.24.3/dart-io/FileSystemEntity/renameSync.html