vertx / io.vertx.reactivex.core.file / FileSystem / truncate

# truncate

`open fun truncate(path: String, len: Long, handler: Handler<AsyncResult<Void>>): FileSystem`

Truncate the file represented by `path` to length `len` in bytes, asynchronously.

The operation will fail if the file does not exist or `len` is less than `zero`.

### Parameters

`path` - the path to the file

`len` - the length to truncate it to

`handler` - the handler that will be called on completion

Return
a reference to this, so the API can be used fluently