These aren’t all of them, but I think they are some of the most useful. # making a directory in another directory that doesn't yet exist... FileUtils.mkdir_p '/path/to/your/directory/that/doesnt/exist/yet' # recursively remove a directory and the contents FileUtils.rm_rf("/path/to/directory/you/want/to/delete") # write a file from the contents of another file... File.open("/path/to/the/file.ext", "wb") {|f| f.write(@your_other_file.read)}