When set on directories, the setgid bit freezes group ownership and 
permissions for all child directories and freezes group ownership for 
all child files.

As root,
	chgrp users /shared
	chmod g+s /shared

This sets the group on "/shared" to "users" and forces all directories 
and files subsequently created under "/shared" to have group "users".

Not too often understood or needed, but handy as heck when it is.

-mj-


Craig White wrote:

> On Thu, 2004-06-24 at 20:17, Alan Dayley wrote:
> 
>>I have googled and checked the PLUG archive but I can't come up with the
>>right search terms to hit the answer to this problem.
>>
>>Let's say that one Linux computer is shared by two people.  They take
>>turns logging in and all is well.  However, they have created a directory
>>called /shared for sharing files between each other.  UserA creates a
>>document or other file and saves it as /shared/file1.  When UserB logs in
>>they want to edit /shared/file1.  But the owner and group permissions on
>>/shared/file1 are set to UserA and UserB can't edit and save it.
>>
>>Both UserA and UserB are in the group Users.  If /shared/file1 is set to
>>group Users, they now can both access it.  But, as soon as one creates a
>>new file, like /shared/file2, it has the group set to the user who created
>>it!
>>
>>How does one set the permissions and ownership of the /shared directory
>>such that all files created there have the correct group always set no
>>matter which user is the owner?
> 
> ----
> chmod g+s /shared
> 
> Craig
> 
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