On 11/04/2011 03:27 AM, RuceLee wrote:
[root@core2duo ~]# chmod 0755 my_directory/ #set perm in octal mode
[root@core2duo ~]# ll -d my_directory/ #no effect on SGIT bit
drwxr-sr-x 2 root root 4096 Nov 4 08:16 my_directory/
[root@core2duo ~]# chmod g-s my_directory/ #set perm in symbolic mode
[root@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.
The documentation from coreutils:
https://www.gnu.org/s/coreutils/manual/html_node/Directory-Setuid-and-Setgid.html#Directory-Setuid-and-Setgid
Basically, you can't use the numeric modes to clear a directory's
set-user-id and set-group-id bits. You have to use the symbolic mode to
clear them.
The RHEL6 man page for 'chmod' actually mentions this in the "SETUID AND
SETGID BITS" section:
chmod preserves a directory’s set-user-ID and
set-group-ID bits unless you explicitly specify
otherwise. You can set or clear the bits with
symbolic modes like u+s and g-s, and you can set
(but not clear) the bits with a numeric mode.
--
Jonathan Billings <jsbillin@xxxxxxxxx>
College of Engineering - CAEN - Unix and Linux Support
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