LFCS Question #703: Real Exam Question with Answer & Explanation

Question

What command should be invoked to give the user sally read and write, but not execute, access to the file strategy.txt using Extended ACL entries?

Options

• Asetfacl -setperm sally:rw strategy.txt
• Bsetfacl -m user::sally+rw strategy.txt
• Csetfacl-m user: sally; rwstrategy.txt
• Dsetfacl -setperm user:sally+rw strategy.txt

Explanation

To grant user sally read and write access to strategy.txt using extended ACLs, the setfacl command with the modify (-m) option and specific user entry is required.

Common mistakes.

• A. The setperm option is not a standard setfacl subcommand or option for modifying specific user permissions.
• B. The syntax user::sally+rw is incorrect; user:: usually refers to the file owner's effective permissions, not a specific named user, and +rw is not the correct way to specify permissions within setfacl.
• D. Similar to option A, setperm is not a valid setfacl option for setting specific user permissions.

Concept tested. Linux Extended ACLs with setfacl

Reference. https://man7.org/linux/man-pages/man1/setfacl.1.html

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