Suppose a scenario where you have to delete some files but you don't have the names of the files to delete beforehand. If you can specify that list with regular expressions, that wouldn't be a problem, but sometimes that is not possible. In these cases you should use a helper transformation that builds the list of files to delete. This recipe shows you how to do it.
For this recipe, assume you want to delete from a source directory all the temporary files that meet two conditions: the files have a .tmp extension and a size of
In order to create and test this recipe, you need a directory with a set of sample files; some of them should have the .tmp extension and zero size. Some example files ...