From owner-freebsd-questions@FreeBSD.ORG Tue Jan 3 22:19:25 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4799C1065672 for ; Tue, 3 Jan 2012 22:19:25 +0000 (UTC) (envelope-from dan@dan.emsphone.com) Received: from email2.allantgroup.com (email2.emsphone.com [199.67.51.116]) by mx1.freebsd.org (Postfix) with ESMTP id E5F058FC08 for ; Tue, 3 Jan 2012 22:19:24 +0000 (UTC) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by email2.allantgroup.com (8.14.4/8.14.4) with ESMTP id q03MJK1s067684 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 3 Jan 2012 16:19:20 -0600 (CST) (envelope-from dan@dan.emsphone.com) Received: from dan.emsphone.com (smmsp@localhost [127.0.0.1]) by dan.emsphone.com (8.14.5/8.14.5) with ESMTP id q03MJK1B034734 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 3 Jan 2012 16:19:20 -0600 (CST) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.14.5/8.14.5/Submit) id q03MJJ1O034733; Tue, 3 Jan 2012 16:19:19 -0600 (CST) (envelope-from dan) Date: Tue, 3 Jan 2012 16:19:19 -0600 From: Dan Nelson To: Polytropon Message-ID: <20120103221919.GH24192@dan.emsphone.com> References: <20120103211150.41f1934d.freebsd@edvax.de> <20120103204902.GG24192@dan.emsphone.com> <20120103220025.823e078f.freebsd@edvax.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120103220025.823e078f.freebsd@edvax.de> X-OS: FreeBSD 8.2-STABLE User-Agent: Mutt/1.5.21 (2010-09-15) X-Virus-Scanned: clamav-milter 0.97.2 at email2.allantgroup.com X-Virus-Status: Clean X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.6 (email2.allantgroup.com [199.67.51.78]); Tue, 03 Jan 2012 16:19:20 -0600 (CST) X-Scanned-By: MIMEDefang 2.68 on 199.67.51.78 Cc: FreeBSD Questions Subject: Re: Exact timestamp for sorting and renaming files according to creation order X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Jan 2012 22:19:25 -0000 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