GNU bug report logs - #9780
sort -u throws out non-duplicates

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Message #22 received at 9780 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Bernhard Rosenkraenzer <bero <at> bero.eu>
Cc: 9780 <at> debbugs.gnu.org
Subject: Re: bug#9780: sort -u throws out non-duplicates
Date: Tue, 18 Oct 2011 13:01:28 +0100

On 10/18/2011 09:48 AM, Bernhard Rosenkraenzer wrote:
> On Mon, 17 Oct 2011 20:22:52 -0600, Eric Blake wrote:
>> On 10/17/2011 06:59 PM, Bernhard Rosenkraenzer wrote:
>> Thanks for the report.  Unfortunately, you did not provide enough
>> information to reproduce this - for example, what platform are you
>> running on?
> 
> Fairly current Linux -- kernel 3.1-rc9, eglibc 2.14.1
> 
>>  Can you narrow it down to a single file of say 5 or so
>> lines?  Can you reproduce the problem with shorter input lines?
> 
> Yes:
> [bero <at> matterhorn ~]$ echo 'libcore/luni/src/main/java/java/security/cert/X509CRLSelector.java libcore/luni/src/main/java/java/security/cert/X509CertSelector.java libcore/luni/src/main/java/java/security/cert/X509Certificate.java libcore/luni/src/main/java/javax/security/cert/X509Certificate.java' |tr ' ' '\n' |sort -u --debug
> sort: using `en_US' sorting rules
> libcore/luni/src/main/java/java/security/cert/X509CertSelector.java
> ___________________________________________________________________
> libcore/luni/src/main/java/java/security/cert/X509CRLSelector.java
> __________________________________________________________________
> libcore/luni/src/main/java/javax/security/cert/X509Certificate.java
> ___________________________________________________________________
> 
> 
> It starts working correctly if any of the entries are removed, yet none of those should match as a duplicate as far as I can see.
> 
>> My guess, although I need more info to confirm it, is that this is
>> not a bug, but rather that java-source-list contains some lines that
>> differ in case and/or punctuation but happen to collate identically.
>> If so, then sort -u is picking the lower-case version as the unique
>> line, at which point your grep for the case-sensitive X509Certificate
>> is obviously failing.
> 
> FWIW changing everything to lower case doesn't change anything
> [bero <at> matterhorn ~]$ echo 'libcore/luni/src/main/java/java/security/cert/x509crlselector.java libcore/luni/src/main/java/java/security/cert/x509certselector.java libcore/luni/src/main/java/java/security/cert/x509certificate.java libcore/luni/src/main/java/javax/security/cert/x509certificate.java' |tr ' ' '\n' |sort -u --debug
> sort: using `en_US' sorting rules
> libcore/luni/src/main/java/java/security/cert/x509certselector.java
> ___________________________________________________________________
> libcore/luni/src/main/java/java/security/cert/x509crlselector.java
> __________________________________________________________________
> libcore/luni/src/main/java/javax/security/cert/x509certificate.java
> ___________________________________________________________________
> 
> 

I can't reproduce this.
There may be some issues currently with debian locale defs?

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=636286

cheers,
Pádraig.

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