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X-HELO:	mx3.rus.uni-stuttgart.de
Date:	Thu, 30 Jan 2020 19:15:16 +0100
From:	Ulli Horlacher <framstag AT rus DOT uni-stuttgart DOT de>
To:	cygwin AT cygwin DOT com
Subject:	hardlinks on directories?
Message-ID:	<20200130181516.GA29782@tik.uni-stuttgart.de>
Mail-Followup-To:	cygwin AT cygwin DOT com
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(I am a UNIX senior admin, but have VERY few knowledge on Windows)

UNIX does not support hard links on directories (in opposite to Windows?). 

I found:

/: uname -a
CYGWIN_NT-10.0 W10dev 3.1.2(0.340/5/3) 2019-12-21 15:25 x86_64 Cygwin

/: ls -ldi /bin /usr/bin
281474976929589 drwxr-xr-x+ 1 admin None 0 Jan 29 16:01 /bin
281474976929589 drwxr-xr-x+ 1 admin None 0 Jan 29 16:01 /usr/bin

/: ls -ldi /lib /usr/lib
281474976929595 drwxr-xr-x+ 1 admin None 0 Jun 15  2018 /lib
281474976929595 drwxr-xr-x+ 1 admin None 0 Jun 15  2018 /usr/lib


Are this directory hard links?
Their content seems to be identical.

(How) can I find out with Cygwin which directories are hard links?
I could run "find / -xdev -type d -printf "%i %p\n" and look for same
inodes. 
Is there a better methode?

/: find / -xdev -type d -printf "%i %p\n" | perl -wne 'push @{$i{$1}},$2 if /^(\d+) (.+)/; END { foreach $n (keys %i) { @f = @{$i{$n}}; print "$n: @f\n" if scalar(@f) > 1} }' | sort -n | head
2: /proc /cygdrive
281474976929589: /bin /usr/bin
281474976929595: /lib /usr/lib
281474976935384: /lib/pkcs11 /usr/lib/pkcs11
281474976935494: /lib/gawk /usr/lib/gawk
281474976938256: /lib/groff /usr/lib/groff
281474976939240: /lib/security /usr/lib/security
281474976939616: /lib/engines-1.1 /usr/lib/engines-1.1
281474976939876: /lib/sasl2_3 /usr/lib/sasl2_3
281474976940081: /lib/p7zip /usr/lib/p7zip

Not so good... too much hits: 
"/lib/pkcs11 /usr/lib/pkcs11" are already in "/lib /usr/lib"


-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK         
Universitaet Stuttgart         E-Mail: horlacher AT tik DOT uni-stuttgart DOT de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<20200130181516 DOT GA29782 AT tik DOT uni-stuttgart DOT de>

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