Groovy features to write to file

Summary:

Content (required):

I've noticed that Groovy provides various methods to write to files such as CSVWriter and CreateFilePrintWriter.

As I understand, both these methods create a new file or overwrite an existing file that matches the name provided in the parameter.

Rather than creating a new file each time the method is called, what I am looking for is a method that allows us to append lines of text to an existing file.

For example, is it possible to have a groovy script that writes to a file as follows:

createFilePrintWriter("test.txt"){out->
 out.println "hello"
}

Then have some more groovy script that appends more text to the same file