Re: chmod 670

["s. keeling" <keeling@nucleus.com>]

Owen Townend <bowbowbow@optushome.com.au>:
> 
>  On Tue, 2007-11-13 at 13:25 -0300, Patricio Rojo wrote:
> > 
> >   I recently noticed that strange things happen if you do 'chmod 670' on
> > a directory that you own, and whose group is set to one you belong.
> > 
> >  - If you try 'ls', then its contents are shown
> >  - If you try 'cd' to it, you get permission denied.

You need execute permission on a dir to do anything to it.  Without
it, you can still access files in it if you know the files' names.

> >  - If you try 'ls -l', you get many interrogation signs (?????) instead
> > of the properties of the file.
> >  - If the user is changed to someone other than you, but the group
> > remains the same, then you get full access.
> > 
> >   Since the permissions are set to full access to the group, and I'm
> > part of that group, shouldn't I get full access to the directory?
> > Anyways, getting many '????' is very awkward.
> 
>    It's my understanding that it is a linear check for permission. UID,

Agreed.  User (ugo) doesn't have x, fail.

>  then GID, then world permissions stopping at a match rather than
>  aggregating the three. This would explain the behaviour.


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