2's company; 3's a realm?

When assigning permissions to a file, one owner and one "world" are considered. But how many groups can access a single file with separate rwx rights? If the answer is more than one group, how would these rwx rights be displayed? Im asking both questions because i am interested in the collaboration possibilities that linux has to offer as well as any worthwhile means of administering such collaborating. thanks in advance for any info.
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A file can only be owned by a single group, but this does not impede collaboration at all.  The easiest way to work around this is to create a special group for owning the file, then make sure that everyone who needs access to that file is a member of that group.  For example, if I have:

drwxrwx---    1 thx1138  justme       2645 Mar 19  1996 netcat.blurb

And I need to have the following people access the file
tom (member of users)
dick (member of mail)
harry (member of adm)

(such that /etc/group looks like this


all I need to do is add a new group to the end of the /etc/groups file.  This line would look like this:


Now, all three individuals have read, write and execute permission for that file.

As you can see, the single-group feature of *nix security offers everything that multiple group ownership does, but is easier to track.

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7of9121699Author Commented:
Thx alot to patowic;

you have hit the nail on the header file, so to speak....   L8R
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