Date: Tue, 3 Jan 2012 16:19:19 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Polytropon <freebsd@edvax.de> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Exact timestamp for sorting and renaming files according to creation order Message-ID: <20120103221919.GH24192@dan.emsphone.com> In-Reply-To: <20120103220025.823e078f.freebsd@edvax.de> References: <20120103211150.41f1934d.freebsd@edvax.de> <20120103204902.GG24192@dan.emsphone.com> <20120103220025.823e078f.freebsd@edvax.de>
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In the last episode (Jan 03), Polytropon said: > On Tue, 3 Jan 2012 14:49:02 -0600, Dan Nelson wrote: > > If you ask for the date to be printed in "float" (F) format, it gives > > more precision. The default is unsigned int (U) format. > > > > % stat -f "%N %FB" /COPYRIGHT > > /COPYRIGHT 1306190895.046721049 > > Strangely, I only get a 000000000 "suffix" for any > time stamp, no matter if I create the file or apply > the command as shown above to an existing file: > > % stat -f "%N %FB" /COPYRIGHT > /COPYRIGHT 1313951230.000000000 > > Am I missing some file system feature? > > Otherwise, this _exactly_ looks like what I'm searching for. It doesn't > need to be a "human-readable" date representation. > > by the way, I'm running FreeBSD 8.2-STABLE/x86 of late August 2011 here, > file system used is UFS2. Try raising the vfs.timestamp_precision sysctl above zero. That gives me useful fractional values on ufs. % sysctl -d vfs.timestamp_precision vfs.timestamp_precision: File timestamp precision ( 0: seconds, 1: sec + ns accurate to 1/HZ, 2: sec + ns truncated to ms, 3+: sec + ns (max. precision)) -- Dan Nelson dnelson@allantgroup.com
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