Răspuns: chmod behaviour

[RuceLee]

Sure,

Here's the input:

[root at core2duo ~]# mkdir my_directory
[root at core2duo ~]# ll -d my_directory/
drwxr-xr-x 2 root root 4096 Nov  4 08:16 my_directory/

[root at core2duo ~]# chmod g+s my_directory/
[root at core2duo ~]# ll -d my_directory/
drwxr-sr-x 2 root root 4096 Nov  4 08:16 my_directory/

[root at core2duo ~]# chmod 0755 my_directory/ #set perm in octal mode
[root at core2duo ~]# ll -d my_directory/ #no effect on SGIT bit
drwxr-sr-x 2 root root 4096 Nov  4 08:16 my_directory/

[root at core2duo ~]# chmod g-s my_directory/ #set perm in symbolic mode
[root at core2duo ~]# ll -d my_directory/ #get back to the execution bit
drwxr-xr-x 2 root root 4096 Nov  4 08:16 my_directory/

I'm confused cuz up until now I assumed the octal and symbolic mode are interchangeable and here is an example where I rather have to use a single mode to get to expected result.


________________________________
De la: Cameron Simpson <cs at zip.com.au>
Către: General Red Hat Linux discussion list <redhat-list at redhat.com>
Trimis: Vineri, 4 Noiembrie 2011 1:41:37
Subiect: Re: chmod behaviour

On 03Nov2011 10:22, RuceLee <bors_ruslan at yahoo.com> wrote:
| Recently I was playing with directory permissions on a ext4 filesystem and I have stumbled
| at a situation when setting up setting up directory SGID behaves not as expected, at least for me.
| 
| For example:
| 
| chmod g+s my_directory works the same as chmod 2755 my_directory
| 
| On the other hand:
| 
| chmod g-s my_directory doesn't work the same as chmod 0755 my_directory
| 
| the latest doing absolutely nothing  to remove the intended SGID bit.
| 
| The latest package I have is coreutils-8.4-13.el6.x86_64

You should probably post a transcript with:

  ls -ld my_directory

before and after each chmod command just so people can see exactly what
the permission state is.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

All my life I have searched for a car that feels a certain way, powerful
like a gorilla, yet soft and yielding like a nerf ball. - Homer Simpson

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