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[Discuss] du question
- Subject: [Discuss] du question
- From: abreauj at gmail.com (John Abreau)
- Date: Fri, 9 Jun 2017 03:52:06 -0400
- In-reply-to: <20170608213547.GA31044@aldeberon>
- References: <20170608213547.GA31044@aldeberon>
du measures disk usage, not individual file size. Two hard links to the same underlying file in two different directories don't use twice the disk space of one instance. If you run two separate instances of du on each of the directories containing the hard links to that file, each would report 35G. If you run a single instance of du to measure both, it would report an aggregate total of 35G; the first one displayed would show as 35G of disk space used and the second as zero additional disk space used. On Thu, Jun 8, 2017 at 5:35 PM, dan moylan <jdm at moylan.us> wrote: > > dan ritter writes: > > On Thu, Jun 08, 2017 at 02:11:22PM -0400, dan moylan wrote: > > > > dan ritter writes: > > > > > > I don't know backintime, but I'm guessing it uses links to > > > > > do file-level snapshots. Bet there's a FAQ. > > > > > > 35G 20170607-120002-419 > > > > > 86M 20170607-230005-357 > > > almost as if there were 86MB of changes in between the > > first and second snapshots. > > of course, that's the whole point of backintime. it > was/is/has been obvious, even to me, but it is not the > question and never has been. > > my question was and is: why does > du -s * > show 86MG for the second and now third backups, and > du -s 20170607-230005-357 > as well as > du -hd1 20170607-230005-357 > show 35MB? > > this is not obvious to me -- if it is to you, please > explain. > > tia, > ole dan > > j. daniel moylan > 84 harvard ave > brookline, ma 02446-6202 > 617-777-0207 (cel) > jdm at moylan.us > www.moylan.us > [no html pls] > _______________________________________________ > Discuss mailing list > Discuss at blu.org > http://lists.blu.org/mailman/listinfo/discuss > -- John Abreau / Executive Director, Boston Linux & Unix Email: abreauj at gmail.com / WWW http://www.abreau.net / PGP-Key-ID 0x920063C6 PGP-Key-Fingerprint A5AD 6BE1 FEFE 8E4F 5C23 C2D0 E885 E17C 9200 63C6
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