local file_name = "file.txt"
local file = assert(io.open(file_name, "w"))
-- write adds no newline, it takes many arguments
file:write("Line 1\n", "Line 2\n")
file:close()
local check = assert(io.open(file_name, "r"))
local text = check:read("a")
check:close()
local size = #text
-- size = 14
print("size = " .. size)