UNIX for Dummies Questions & Answers

Hi All

I am running Ubuntu linux flavour.
I need provide multiple users belonging to the same group access to a dir where they can write files but are not supposed to remove or rename files. users outside the group should be able to read and write to the dir.

i have set the permission of the dir to 606 (chmod 606). The group members are however able rename files. How can achieve my goal as set above?

Regards
Simza

606 make no sense : I disallows people in the group to access but allows others to write/read...

Hi vbe

Thanks for your quick reply :-).
Let's not debate whether 606 makes sense or not.

The question is does 606 do what 606 is expected to do (i.e disallow group members mv files owner by other members in the group) if not how can i achieve what 606 is supposed to do?

Simza

(was on phone...) worse 606 doesnt even let you enter the directory even if you were the owner... are you sure you are talking of the directory? if so show us the output of

Code:

ls -ald <dir>

For you need execution on directories to traverse...

It makes no sense because your entire problem statement centers around granting some permissions to some unnamed group but the permission 606 grants nothing to any group. Whatever permissions the members of that group have on a 606 directory or file, they have them because they are granted to everyone.

You should provide some specifics. Show us a long listing of the file hierarchy, with owner/group/perms, and examples of the commands that group members and non-members should be allowed to use and forbidden from using.

Does that mean creating a new file in the directory, or modifying an existing file, or both?

Reading a "dir" is essentially getting a file list, such as what ls does. Writing to a "dir" means creating/deleting/renaming files. Is this what you actually intended to say? Or do you actually mean reading and writing to files within the directory?

Sounds to me like members of the group are intended to have less permissions than those not in the group.

Regards,
Alister

Thanks.

let me rephrase my question:

I have two users paul and nelly. they belong to a group named students

I would like users in the group students (paul and nelly) to be able to access dir /app/projects/final and copy files to this directory (ftp) . nelly should not be able to rm/mv files owned by paul and vice versa.

True 606 will not work because for access to the directory you need to have execute permission on the directory.

however 700 (just avoiding 707 to focus my question) for the dir does not work either even if the file permission is the default 644.

how can i achieve my hopefully now clear requirement above.

Simza

In order to protect files from non-owners re-/moving them, try the "sticky bit"