GNU bug report logs - #12285
uniq on a UTF8 file with roman numerals

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From: Pádraig Brady <P <at> draigBrady.com>
To: "P. Michaud" <pierrecmichaud <at> aol.com>
Cc: 12285 <at> debbugs.gnu.org
Subject: bug#12285: uniq on a UTF8 file with roman numerals
Date: Mon, 27 Aug 2012 01:16:24 +0100

tag 12285 + notabug
close 12285
stop

more info below...

On 08/26/2012 09:53 PM, Pádraig Brady wrote:
> On 08/26/2012 06:49 PM, P. Michaud wrote:
>> Hello,
>>
>> I used the command
>>
>> "uniq -dc myfile.txt'
>>
>> here are some lines of the output
>>
>>       2 ☼ turvy
>>       2 ☼ with gay abandon
>>       2 ☼ with reckless abandon
>>      10 ☼ yyⅰ
>>       9 ☼ yyⅹⅲ
>>       2 ☼ yyⅺ
>>      12 ☼ zzⅰ
>>
>>
>> The three first lines above are correct and correspond to real duplicates lines in the file, but the numbers on the 4 last one are erroneous, each of them correspond to a single line in the file.
>>
>> Yours faithfully.
>>
>> Pierre Michaud
> 
> What system are you on
> What version of uniq
> What is the input exactly
> 
> I suspect your locale is equating roman numerals (though that is surprising),

It seems that these roman numerals are treated a equal in collating order,
so uniq is behaving as expected:

$ sort <(printf "%s\n" ⅲ ⅱ ⅰ)
ⅲ
ⅱ
ⅰ
$ uniq -dc <(printf "%s\n" ⅲ ⅱ ⅰ)
      3 ⅲ

You can avoid this behaviour by doing a byte comparison
by using LC_ALL=C.

$ LC_ALL=C sort <(printf "%s\n" ⅲ ⅱ ⅰ)
ⅰ
ⅱ
ⅲ
$ LC_ALL=C uniq -c <(printf "%s\n" ⅲ ⅱ ⅰ)
      1 ⅲ
      1 ⅱ
      1 ⅰ

thanks,
Pádraig.

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