So someone could have tried to delete a directory not knowing that the movie footage was being kept somewhere deeper on the tree and accidentally deleted it. If you use rm -r to delete a directory with dozens of such files you would have to confirm each file if you did not use the -f. Usually Unix will ask for confirmation or give you an error if you try to delete a write-only file or something like that. f stands for "force", and overrides file protections, and you use it a lot to avoid having to confirm each and every file you're trying to delete. r stands for "recursively", which means the function will dive into directories and subdirectories of what you're trying to delete and also delete everything within it before deleting the directories themselves. I haven't used Unix much, so anyone can feel free to correct me, but my basic understand is:
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