getfacl
AccountsPackage: acl
Prints a file's full access control list, what the + in ls -l announces without detailing. Keep one next to a backup: rsync -a and tar without options do not copy ACLs.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
getfacl -R- Walks a tree recursively and writes out every ACL.
getfacl -Rproduces a text snapshot to keep beside an archive: it restores nothing on its own, but shows whatrsync -aandtarwithout--aclsleft behind.