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Old 03-17-2010, 02:00 PM   #1
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file modification time smaller than a second


Is it possible to get file modification times measured to less than a second? Like milisecond, nanosecond, 10th of a second.
Old 03-17-2010, 02:07 PM   #2
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%N nanoseconds (000000000..999999999)
date -r /tmp "+%s/%N"
get seconds since 1970-01-01 00:00:00 UTC/nanoseconds

Last edited by troop; 03-17-2010 at 02:10 PM.
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Old 03-17-2010, 02:56 PM   #3
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Thanks. Your fix would have worked if the file system actually recorded the time at that granularity when the file was created. I tried the command on several files and everyone came out to 0 nanoseconds. I don't believe that is a likely scenario. I'm bummed.
Old 03-18-2010, 04:05 AM   #4
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It depends on the filesystem
Since kernel 2.5.48, the stat structure supports nanosecond resolution for the three file timestamp fields. Glibc exposes the nanosecond component of each field using names either of the form st_atim.tv_nsec, if the _BSD_SOURCE or _SVID_SOURCE feature test macro is defined, or of the form st_atimensec, if neither of these macros is defined. On file systems that do not support sub-second timestamps, these nanosecond fields are returned with the value 0.

If you know any C you can try it ...


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