在目录中查找最新的文件而不读取其中的所有内容 [英] Find the most recent file in a directory without reading all the contents of it

问题描述

我试图在庞大的文件系统中找出最新的文件.一种方法是浏览所有目录 - 一次一个，读取其内容，选择最新的文件等.

I'm trying to find out the latest file in a huge filesystem. One way to do this is to go through all directories - one at a time, read its contents, select the latest file etc.

明显的缺点是我必须在特定目录中获取所有文件.我想知道 Python [1] 中是否有一个魔法"调用，Unix 支持它只获取目录中的最新文件.

The obvious drawback is I have to get all the files in a specific directory. I was wondering whether there was a 'magic' call in Python [1] which Unix supports to get just the latest file in a directory.

[1].我的应用程序使用 Python，但如果 stdlib 中不存在现成的解决方案，请使用系统调用提供 C(语言)替代方案.我愿意编写一个 C 扩展并完成这项工作.

[1]. My application is in Python, but if a readymade solution doesnt exist in stdlib, please provide C (lanuage) alternatives using system calls. I'm willing to write a C-extension and make this work.

谢谢

更新:我想我应该解释一下为什么 inotify 类型的解决方案对我不起作用.我只是在寻找一个使用 Python/C 的系统调用，它可以给我最新的文件.是的，可以使用 inotify(或类似的总体设置)来监控 FS 更改，但给定一个随机目录，我如何找到最新的文件是问题的本质.

update: I suppose I should offer an explanation on why an inotify type solution wont work for me. I was simply looking for a system call using Python/C which could give me the latest file. Yes, one could have inotify (or a similar overarching setup) which monitors FS changes but given a random directory how do I find the latest file is the essence of the question.

推荐答案

我不相信Unix"或 Posix 系统一般都支持独立于平台的文件系统更改通知.

I do not believe that generically 'Unix' or Posix systems support a platform independent file system change notification.

也就是说，有很多 unixy 系统可以做到:

That said, there are lots of unixy systems that do:

• OS X
  
  • FSEvents
  • fslogger
  • DTrace + 系统调用
  • pnotify
  • Kqueue
  • OS X
    
    • FSEvents
    • fslogger
    • DTrace + syscall
    • pnotify
    • Kqueue
    • inotify
    • pnotify
    • epoll
    • DTrace
    • 通知
    • Kqueue
    • Kqueue 仅在 BSD 上的 Python 中直接支持
    • Pyinotify 仅适用于 Linux
    • FSEvents 仅适用于 Darwin/OS X
    • Gamin 仅适用于 Linux 和 BSD
    • Kqueue is directly supported in Python only on BSD
    • Pyinotify only on Linux
    • FSEvents only on Darwin / OS X
    • Gamin only on Linux and BSD

    其他人建议尝试解释 ls.不要那样做.如果您觉得必须使用 Unix 工具，大多数 Unix/Linux/Posix 风格也有 stat 作为实用程序.stat 实用程序 具有可配置的输出和您可以设置要解析的字段.它是 GNU 核心实用程序的一部分.

    Others have suggested trying to interpret ls. Don't do that. If you feel compelled to use a Unix tool, most Unix / Linux / Posix flavors also have stat as a utility. The stat utility has configurable output and you can set the fields that you want to parse. It is part of the GNU core utilities.

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