010-160 File Permissions and Ownership 4

Question 1

What does 'chmod g-w file.txt' do?

Accepted Answer

Removes write permission from the group

Answer

The minus sign in symbolic notation removes the specified permission; g-w removes write from the group.

Question 2

A new file is created while umask is 0027. What are the resulting file permissions?

Accepted Answer

640 (rw-r-----)

Answer

Files start at 0666; 0666 - 0027 = 0640, which is rw-r-----.

Question 3

Which command shows the numeric (octal) permissions of a file?

Accepted Answer

stat file.txt

Answer

The stat command displays detailed file information including octal permissions.

Question 4

What does SGID do when set on a directory?

Accepted Answer

New files in the directory inherit the directory's group

Answer

SGID on a directory causes newly created files to inherit the directory's group instead of the creator's primary group.

Question 5

User 'root' owns a file with permissions ----------. Can root read the file?

Accepted Answer

Yes, root bypasses permission checks

Answer

Root (UID 0) bypasses DAC permission checks and can read, write, and execute any file.

(010-160) LPI Linux Essentials Practice Test