[SOLVED]a file owned by multiple owners

[zacinfinite]

is it possible in Linux to make a file belong to more than one group?
Also is it possible to have more than one owner on a file?

[bjlockie]

No to both.

If you need a file readable by more than one use (but not anyone), make a new group that each use you want can be a member of.

http://www.perlfect.com/articles/chmod.shtml
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[Hu]

You could also use filesystem ACLs to grant access selectively without creating groups for every possible permutation of access.

[Spidey]

Tutorial here: http://www.gentoo-wiki.info/HOWTO_Use_filesystem_ACLs
You need to add xattr and acl support in your kernel.