mtime vs ctime vs atime

geekster

于 2011-08-25 11:28:47 发布

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文章标签： permissions file access system

本文链接：https://blog.youkuaiyun.com/geekster/article/details/6717762

本文详细解释了文件系统的三种时间属性：mtime（最后修改时间）、ctime（状态改变时间）及atime（最后访问时间）。mtime记录文件内容最后一次被修改的时间；ctime记录文件元数据最后一次更改的时间，包括权限和所有权的变化等；atime则记录文件最后一次被访问的时间。文章还介绍了如何通过不同的命令查看这些时间戳以及一些文件系统的特殊选项。

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mtime: time of last modification (ls -l),

* ctime: time of last status change (ls -lc) and

* atime: time of last access (ls -lu).

Note that ctime is not the time of file creation. Writing to a file changes its mtime, ctime, and atime. A change in file permissions or file ownership changes its ctime and atime. Reading a file changes its atime. File systems mounted with the noatime option do not update the atime on reads, and the relatime option provides for updates only if the previous atime is older than the mtime or ctime. Unlike atime and mtime, ctime cannot be set with utime() (as used e.g. by touch); the only way to set it to an arbitrary value is by changing the system clock.
stat命令可以显示所有