A file with UNIX permissions rwxrwxr-- does not allow writing by ______.

Question

BlackTom AI · Accepted Answer

Restating the question: A file with UNIX permissions rwxrwxr-- does not allow writing by ______.

Option a: a. users outside the group owning the file
Reasoning: In these permissions, 'others' (users outside the group) have the last set of permissions, which are 'r--'. This means reading is allowed, but writing is not. Therefore, this option correctly identifies who cannot write.

Option b: b. the owner of the file
Reasoning: The owner has 'rwx' permissions, which include write access. Thus, the owner can write, so this statement would be false in the context of who cannot write.

Option c: c. users in the group owning the file
Reasoning: The group permissions are also 'rwx', granting read, write, and execute rights to group members. Therefore, these users can write, so this option does not describe who cannot write.

Option d: d. all of the above
Reasoning: Since both the owner and the group have write permissions, and only others lack write permission, it is not true that all of the above cannot write. This makes this option incorrect.

Summary: The only group that cannot write under rwxrwxr-- is the users outside the group owning the file (others).

FIT1093_S2_2025 Week 8 MCQ: System Security - Entity Authentication & Access Control

A file with UNIX permissions rwxrwxr-- does not allow writing by ______.

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