如何在linux上显示文件上次修改时间
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How to display file last modification time on linux
提问by JavaMobile
I want to write a C program to display the file last modification time in microsecond or millisecond. How could I do? Could you give me a help?
我想编写一个 C 程序，以微秒或毫秒为单位显示文件上次修改时间。我怎么办？你能给我一个帮助吗？
Thanks very much.
非常感谢。
采纳答案by caf
The stat()function is used. In sufficiently recent versions of glibc, st_mtim(note: no trailing e) is a field of type struct timespecthat holds the file modification time:
该stat()功能使用。在足够新的 glibc 版本中，st_mtim（注意：没有尾随e）是一个struct timespec保存文件修改时间的类型字段：
struct stat st;
if (stat(filename, &st)) {
perror(filename);
} else {
printf("%s: mtime = %lld.%.9ld\n", filename, (long long)st.st_mtim.tv_sec, st.st_mtim.tv_nsec);
}
You should check for the presence of st_mtimin struct statin your build system, and be ready to fall back to st_mtime(which has type time_t, and only 1 second resolution) if it is not present.
您应该检查构建系统中是否存在st_mtimin struct stat，如果不存在，则准备回退到st_mtime（具有 type time_t，并且只有 1 秒的分辨率）。
回答by ZelluX
You may use stat() function, it will return struct stat which contains time of last modification of a file. Here is the man page http://linux.die.net/man/2/stat. As to precision, it depends on whether your file system supports sub-second timestamps or not.
您可以使用 stat() 函数，它会返回 struct stat ，其中包含最后修改文件的时间。这是手册页http://linux.die.net/man/2/stat。至于精度，这取决于您的文件系统是否支持亚秒级时间戳。
回答by Nikita Rybak
回答by Matt
JFS, XFS, ext4, and Btrfs support nanosecond timestamps.
JFS、XFS、ext4 和 Btrfs 支持纳秒时间戳。
The book "The Linux Programming Interface" by Michael Kerrisk has a good section on File attributes
Michael Kerrisk 所著的“Linux 编程接口”一书对文件属性有很好的介绍
回答by byte_array
There is a stat command, which you can use directly
有一个stat命令，你可以直接使用
http://www.thegeekstuff.com/2009/07/unix-stat-command-how-to-identify-file-attributes/
http://www.thegeekstuff.com/2009/07/unix-stat-command-how-to-identify-file-attributes/
