topic Re: trouble granting permissions, please help asap in Operating System - Linux

trouble granting permissions, please help asap

Sharfuddin — Tue, 24 Feb 2004 11:43:54 GMT

Actually i have trouble in granting rights/permissions over a resource(file/directory), on per user and or per group basis, as we normally and easily used to do in Microsoft(server/professional). Following is the condition/scenario:

1, user 'a' who belongs to a group 'a', creates a file, named 'a-file'.

2, 'a' wants to give 'read' permission, over 'a-file', to 'accounts' group, but there is a user in 'accounts', named 'super-user', only to whome 'a' wants to give 'read' and 'write' both.

3, 'a' wants to give 'read' permission, over 'a-file', to 'sales' group.

4, 'a' wants to give 'read' and 'write' permissions, over 'a-file', to 'managers' group.

Now please let me know what is the solution, of above mentioned condition. Please let me know the steps(command/actions), and procedures. I know abt 'chmod' and and the numbers and various combinations used for granting permissions(ro = 4, w = 2, e = 1, and rwe = 7).

Note: I m using Red Hat Linux, 7.2, and 8.0.

Thanks

Re: trouble granting permissions, please help asap

Martin P.J. Zinser — Tue, 24 Feb 2004 17:15:38 GMT

Hello,

what you want to do is at least extremely hard if not impossible with basic Linux file protections. You do need to look into ACLs for this. Documentation on this topic can be found e.g. at

http://www.suse.de/~agruen/acl/chapter/fs_acl-en.pdf

Greetings, Martin

Re: trouble granting permissions, please help asap

Steven E. Protter — Tue, 24 Feb 2004 17:19:49 GMT

check the umask command for user a

It is possible to set things so that evey file he creates is readable by all groups.

If that doesn't work, you can do this.

After file creation:

chmod o+r filename

Then all groups can read it.

The only practical concern at that point is do all groups have access to the folder the file is sitting in.

Sorry about the delay, I left this message half posted for well over an hour.

SEP

Re: trouble granting permissions, please help asap

T G Manikandan — Wed, 25 Feb 2004 00:31:01 GMT

You will have to check acl's to resolve this.