packed permission bits in file systems?

[Andrew Beals]

It's definitely not nor has ever been a feature of The One True Unix(tm).

Never saw it on linux, either.

On 6/3/10, Jeffrey Watts <jeffrey.w.watts at gmail.com> wrote:
> I don't recall that ever being used on Linux - at least from ext2 onwards.
> I also don't recall ever working on any other Unix that did that either.
> Perhaps it's a minimal or special-case filesystem option for some OSes?
>
> Jeffrey.
>
> On Thu, Jun 3, 2010 at 1:09 PM, David Nicol <davidnicol at gmail.com> wrote:
>
>>
>> http://en.wikipedia.org/wiki/Talk:Filesystem_permissions#Packed_permission_bits.3F
>>
>>
>> Clearly, ext3 has moved beyond "packed permission bits" if that ever
>> was a production concept.
>>
>>
>> [david at hexaflexagon scrabble]$ touch BLOP
>> [david at hexaflexagon scrabble]$ ls -l BLOP
>> -rw-r--r-- 1 david david 0 Jun  3 04:11 BLOP
>> [david at hexaflexagon scrabble]$ chmod o+x BLOP
>> [david at hexaflexagon scrabble]$ ls -l BLOP
>> -rw-r--r-x 1 david david 0 Jun  3 04:11 BLOP
>> [david at hexaflexagon scrabble]$
>>
>> Under packed permissions, granting for OTHERS would grant for USER and
>> GROUP too.
>>
>> Here's my question: When did packed permissions stop being used, if
>> they ever were?
>> Does anyone else remember "chmod o+w foo" silently implying "chmod
>> ugo+w foo" and if so how log ago was that?
>>
>>
>> --
>> "I'm not giving in an inch to fear" --David Crosby
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>