A systems administrator requires that all files that are created by the user named web have read- only permissions by the owner. Which of the following commands will satisfy this requirement?

The correct answer is C. echo "umask 377" >> /home/web/.bashrc. The umask defines which permission bits are masked off when new files are created. With a umask of 377, the resulting file permissions are calculated as 666 (default file permissions) ANDed with the complement of 377 (which is 400), yielding permissions of 400 (r--------)…

System Management

Question

A systems administrator requires that all files that are created by the user named web have read- only permissions by the owner. Which of the following commands will satisfy this requirement?

Options

Achown web:web /home/web
Bchmod -R 400 /home/web
Cecho "umask 377" >> /home/web/.bashrc
Dsetfacl read /home/web

How the community answered

(33 responses)

A
12% (4)
B
6% (2)
C
79% (26)
D
3% (1)

Explanation

The umask defines which permission bits are masked off when new files are created. With a umask of 377, the resulting file permissions are calculated as 666 (default file permissions) ANDed with the complement of 377 (which is 400), yielding permissions of 400 (r--------) - read-only for the owner, no permissions for group or others. Appending this to /home/web/.bashrc ensures it applies every time the user logs in. Option A changes directory ownership, not permissions. Option B retroactively sets permissions on existing files with chmod -R but does not affect future files. Option D uses incorrect setfacl syntax and would not configure a default permission mask.

Topics

#umask#File Permissions#Default Permissions#User Configuration

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