maintaining .group file onership
My question has to do with maintaining group ownership of files.
I have created a group called "budget".
I added two users to the budget group:
I created a directory called "2006budget"
drwxrwxr-- 11 root budget 4096 Feb 15 10:00 2006budget
I added the file:
-rwxrwxr-- 1 root budget 38520 Feb 15 10:00 2006trvl
When user1 modifies the file the attributes change to:
-rwxrwxr-- 1 user1 user1 39000 Feb 15 11:00 2006trvl
When user2 tries to modify the file it is now read only to user2. Is there a way to maintain the .group attribute when a user modifies a file? Also, for example, if user1 creates a new file in this directory is there a way to have that file written with the .group ownership so that user2 can modify it.
I know how to chown .budget user1, but I don't want to have to do that every time a file is created or modified by as group member.
I hope I did not make a mess of this question and I appreciate your patience.