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Re: Some globstar patterns produce duplicate entries and a null filename


From: Ulf Magnusson
Subject: Re: Some globstar patterns produce duplicate entries and a null filename
Date: Sun, 2 Dec 2012 17:57:21 +0100

On Sun, Dec 2, 2012 at 5:42 PM, Ulf Magnusson <address@hidden> wrote:
> On Sun, Dec 2, 2012 at 5:40 PM, Ulf Magnusson <address@hidden> wrote:
>> On Sun, Dec 2, 2012 at 4:58 PM, Roman Rakus <address@hidden> wrote:
>>> On 12/01/2012 04:41 PM, Ulf Magnusson wrote:
>>>>
>>>> GNU bash, version 4.2.24(1)-release (i686-pc-linux-gnu)
>>>>
>>>> Take the following example, assumed to be run in an empty directory:
>>>>
>>>> $ mkdir a
>>>> $ echo **
>>>> a
>>>> $ echo **/**
>>>>   a a
>>>> $ echo **/**/**
>>>>   a a a
>>>>
>>>> I would expect the result to be just 'a' in all cases.
>>>>
>>>> You also get back a null filename, as shown by
>>>>
>>>> $ for f in **/**/**; do echo "'$f'"; done
>>>> ''
>>>> 'a'
>>>> 'a'
>>>> 'a'
>>>>
>>>> /Ulf
>>>>
>>> I can't reproduce it on my Fedora with bash 4.2.10 nor 4.2.39. Tried turn on
>>> and off extglob shell option.
>>> Can you please resend your report with `bashbug' script? Or at least say
>>> which linux distribution you are using?
>>>
>>> RR
>>>
>>
>> Ubuntu 12.04. My configuration is
>> https://github.com/ulfalizer/Configuration-files/blob/master/bash,
>> which I 'source' from the standard Ubuntu ~/.bash. I noticed the bug
>> while implementing the _super_glob function.
>>
>> bashbug information:
>>
>> Machine: i686
>> OS: linux-gnu
>> Compiler: gcc
>> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686'
>> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu'
>> -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
>> -DSHELL -DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include
>> -I../bash/lib  -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector
>> --param=ssp-buffer-size=4 -Wformat -Wformat-security
>> -Werror=format-security -Wall
>> uname output: Linux Huvuddator 3.2.0-32-generic-pae #51-Ubuntu SMP Wed
>> Sep 26 21:54:23 UTC 2012 i686 i686 i386 GNU/Linux
>> Machine Type: i686-pc-linux-gnu
>>
>> /Ulf
>
> Left out some bashbug information:
>
> Bash Version: 4.2
> Patch Level: 24
> Release Status: release
>
> /Ulf

Oh - you need to enable 'globstar', not 'extglob'. :)

/Ulf



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