function _init(args)
	if #args == 1 then
		tree(args[1], "")
	else
		print("Wrong usage. Correct: tree [root]")
	end
end

function tree(filename, prefix)
	--Display
	print(prefix .. "-" .. filename)
	
	--Traverse
	if fs.isdir(filename) then
		fs.cd(filename)
		folder = fs.list()
		if #folder > 0 then
			for i=1,#folder do
				folder = fs.list() -- Needed here for unknown reason. Probably the folder table declared above doesn't survive the recursive call to tree(), which is why it is read here again
				if not (folder[i] == nil) then
					tree(filename .. folder[i], prefix .. " |")
				end
			end
		end
	
		--Return
		fs.cd("..")
	end
end