The valid reasons not to use hard links are B. Each hard link has individual ownership, permissions, and ACLs, which can lead to unintended disclosure of file content, and C. Hard links are specific to one filesystem and cannot point to files on another filesystem.
While useful, there are some limitations to what hard links can do. For starters, they can only be created for regular files (not directories or special files). Also, a hard link cannot span multiple filesystems. They only work when the new hard link exists on the same filesystem as the original
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