Re: linux links
You can create links with the "ln" command. There are two sorts of links:
Hard Links: (ln)
This is really two directory entries that point to the same physical location on disk. They must both be in the same file system. The file will continue to exist and occupy space as long as either one of the links exists.
Soft or Symbolic links (ln -s)
This is a link where a secondary name is associated with a file. Symbolic links can span file systems. A symbolic link does NOT guarantee the existance of the file; if you create a symlink to a file and then delete the original, it is gone, and you are left with a symlink pointing to nowhere.
Ownership on symbolic links is pretty meaningless. Access to the file is a function of the permissions on the target file, not the permissions on the link.