LFCS Question #720: Real Exam Question with Answer & Explanation

Question

You want the default permissions for your files to bE.rw-r-. How must you set umask?

Options

• A037
• B640
• C038
• D027

Explanation

The umask value determines the default permissions for newly created files by specifying which permission bits are removed from the default mask of 666.

Common mistakes.

• B. 640 represents the desired file permissions, not the umask value used to achieve them.
• C. 038 is an invalid octal umask value because '8' is not a valid octal digit.
• D. While umask 027 would also result in rw-r----- (640) for files, it specifies removing only the write permission for the group (2) as opposed to write and execute (3) provided by 037.

Concept tested. Umask permissions calculation

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

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