Linux Permissions 3

Question 1

What octal value sets the setuid bit along with rwxr-xr-x permissions?

Accepted Answer

4755

Answer

The setuid bit is represented by the leading 4 in octal, so 4755 means setuid + rwxr-xr-x.

Question 2

A user runs ls -l and sees -rwsr-xr-x on /usr/bin/passwd. What does the 's' in the owner execute position indicate?

Accepted Answer

The setuid bit is set and the file is executable

Answer

A lowercase 's' in the owner's execute position means the setuid bit is set and the owner execute bit is also set.

Question 3

Which command recursively changes permissions for all files and directories under /var/www to 755?

Accepted Answer

chmod -R 755 /var/www

Answer

The -R flag in chmod applies the permission change recursively to all files and subdirectories.

Question 4

What does ACL stand for in the context of Linux file permissions?

Accepted Answer

Access Control List

Answer

ACL stands for Access Control List, which allows more granular permission assignments beyond the traditional owner/group/other model.

Question 5

Which command is used to view the ACL entries on a file?

Accepted Answer

getfacl file.txt

Answer

The `getfacl` command displays the access control list entries for a file or directory.

Linux Practice Test