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File.safe_unlink - deletes the files in arg and returns an array of files deleted File.syscopy - copies the file at 1st arg to the file at 2nd arg Generator#each - enumerates the elements - rewinds the generator and only then enumerates the elements Generator.new - creates a new generator from an Enumerable object - creates a new generator from a block Generator#next? - returns false for empty generator - returns true for non-empty generator - returns true if the generator has not reached the end yet - returns false if the generator has reached the end - returns false if end? returns true Generator#next - raises an EOFError on empty generator - raises an EOFError if no elements available - raises an EOFError if end? returns true - returns the element at the current position and moves forward Killed