在Lua中，可以使用io库来进行文件读写操作。以下是一些常用的文件读写操作示例：

读取文件内容：

local file = io.open("file.txt", "r")if file thenlocal content = file:read("*a")print(content)file:close()elseprint("Error: Unable to open file")end

写入内容到文件：

local file = io.open("file.txt", "w")if file thenfile:write("Hello, world!")file:close()elseprint("Error: Unable to open file")end

追加内容到文件：

local file = io.open("file.txt", "a")if file thenfile:write("\nThis is a new line")file:close()elseprint("Error: Unable to open file")end

在进行文件读写操作时，需要确保文件的读写权限并在操作完成后关闭文件流。