function getFile(file_name)     local f = assert(io.open(file_name, ‘r‘))    local string = f:read("*all")    f:close()    return stringendfunction writeFile(file_name,string) local f = assert(io.open(file_name, ‘w‘)) f:write(string) f:close()end--从命令行获取参数， 如果有参数则遍历指定目录，没有参数遍历当前目录if arg[1] ~= nil then     cmd = "ls "..arg[1]else     cmd = "ls"endprint("cmd", cmd)--io.popen 返回的是一个FILE，跟c里面的popen一样local s = io.popen(cmd)local fileLists = s:read("*all")print(fileLists)while true do    --从文件列表里一行一行的获取文件名    _,end_pos, line = string.find(fileLists, "([^\n\r]+.txt)", start_pos)        if not end_pos then             break        end--    print ("wld", line)    local str = getFile(line)    --把每一行的末尾 1, 替换为 0,    local new =string.gsub(str, "1,\n", "0,\n");    --替换后的字符串写入到文件。以前的内容会清空    writeFile(line, new)    start_pos = end_pos + 1end