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The blog article details the use of POSIX ACLs to manage permissions on Linux systems finely. It explains `getfacl` for retrieving ACLs, essential for viewing permissions along with user details, and `setfacl` for editing ACLs. Techniques for backing up ACLs using `getfacl` and restoring them through `setfacl` are discussed, highlighting their importance in multi-user environments and suggesting installation via system package managers.