How to add owner to the folder in MAC OS X?

Question

I'm trying to ADD an owner to folder in MAC OS X.

I tried to use chown, but it does change owner, to another new user. I don't want to change it, I just want to ADD new owner.

Details:

I have folder "test" that owner is Admin user, I want to add owner Admin2 to that folder, without removing Admin user owner. How can I do it?

Thanks a lot.

I want the same effect, like adding Users: from UI +.

Answer 1

As noted a file can only have one owner. What you are looking for is how to set Access Control Lists (ACL) for file system entries. These grant or deny any of a set of specific users or group members any of a set of specific permissions to individual files or directories. See, for example, this article for a quick introduction to ACLs on OS X. Read the OS X chmod man page (man chmod) for the details on managing ACLs via the command line.

Answer 2

You need to add both users to the same user group. Then chgrp of the test to this group. That way multiple users can "own" one file.

Then run

$ dscl . list /users
$ dscl . list /groups

to find which users belong to which groups.