Re: chgrp in Windows

[Sam Edge <cygwin at dwalin dot fsnet dot co dot uk>]

On 25/02/2015 00:08, Warren Young wrote:
>> On Feb 24, 2015, at 4:57 PM, Warren Young <warren@etr-usa.com> wrote:
>>
>>> The result of chown I can see in Windows Explorer as the Owner but where is the group information?
>> Itâs over on the Security tab of the same window youâre looking at: âGroup or user namesâ.
> I just remembered that that tab isnât always visible.  If youâre running a âhomeâ version of Windows, thereâs a pretty good chance you donât even see this tab.
>
> If thatâs your situation, you can un-hide this tab:
>
>   http://goo.gl/MDoBo1
>   http://goo.gl/C2p2N5
>
> That tab can also be hidden because:
>
> - a group policy setting disabled it
>
> - youâre working on a non-NTFS drive
>
> - youâre working on a shared network drive that doesnât fully support Windows security
>
> etc.
>
I'm pretty sure Cygwin uses the NTFS "primary group" in which to store
the POSIX group ID.

Unfortunately, the owning group ("primary group" in
NTFS/Active-Directory-speak) for a file or folder isn't displayed at all
in the Explorer GUI, only the owner (user in POSIX-speak). To confuse
matters more, in Windows the owning user can actually be a group.

The primary group was only there to support things like the (moribund)
POSIX subsystem in Windows NT-series OSes and the network SFU (services
for UNIX) and is not used by the 'native' Windows subsystem at all,
although it is propagated through the CIFS network filesystem which is
handy for us.

You'll need to add a bolt-on (like SFU I think) if you want to see a tab
on the Explorer security settings showing the primary group. Or just use
Cygwin ls. :-)

-- 
Sam Edge


-- 
Sam Edge


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