Sorting may be harder, but that did not prevent choroba from mentioning e.g. opendir and File::Copy in the very first post in this thread. Given how most shell commands, etc. sort the contents of directory listings, he may not even realize it is something he will likely have to deal with! Or alternatively, he may have a handle on the sorting part. Sorting is fairly common and Perl does have a built-in function for it after all. On the other hand, array splicing, traversing directories, etc. could be another matter entirely. It's not even clear to me that sorting is part of the question.
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