Date: Tue, 22 May 2012 16:26:18 -0500 (CDT) From: Robert Bonomi <bonomi@mail.r-bonomi.com> To: dteske@freebsd.org, freebsd-questions@freebsd.org, freebsd@dreamchaser.org Subject: RE: hard link identification Message-ID: <201205222126.q4MLQImN071457@mail.r-bonomi.com> In-Reply-To: <0ae301cd385c$31813370$94839a50$@freebsd.org>
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<dteske@freebsd.org> wrote; > > For directories, the link-count is quite obviously the number of filesystem > entities contained within. That is *INCORRECT*. The link-count on a directory is the number of dir- ectory entries (file names) tht resolve to it, just as with any other file. The count starts at *TWO* -- one for the directory name itself, plus one for the '.' self-refernce 'in' that directory -- plus one for the '..' reference in each and every sub-directory that is in that directory, PLUS one (albeit rare) for any other hard-linked names that also resolve to that diretory. To wit: $ mkdir foo # 'ls -l foo' will show a link-count of 2 $ touch foo/bar # 'ls -l foo' will show a link-count of 2 $ mkdir foo/baz # 'ls -l foo' will show a link-count of 3 $ ln -s foo foo2 # 'ls -l foo' will show a link-count of 3 $ ln foo quux # 'ls -l foo' will show a link-count of 4
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