FREE Linux+ User and Group Permissions Questions and Answers

Question 1

A system administrator has set the umask value to `0027` for all users. What will the permissions be for a newly created directory?

Accepted Answer

drwxr-x---

Answer

drwxr-xr-x

Answer

drw-r-----

Answer

-rwxr-x---

Question 2

An executable file has its permissions displayed as `-rwsr-xr-x`. What is the primary effect of the 's' in the user/owner permissions section?

Accepted Answer

The file will execute with the permissions of the file's owner, regardless of who runs it.

Answer

Any user who runs the file will have their primary group temporarily changed to the file's group.

Answer

Only the file's owner and members of the root group can execute the file.

Answer

It indicates a 'secure' executable that cannot be modified by any user, including root.

Question 3

A project manager wants to create a shared directory at `/srv/project_files`. Any new file or subdirectory created within this location must automatically be owned by the `developers` group. Which command will accomplish this?

Accepted Answer

chgrp developers /srv/project_files && chmod g+s /srv/project_files

Answer

chmod u+s /srv/project_files

Answer

chown :developers /srv/project_files && chmod +t /srv/project_files

Answer

setfacl -m g:developers:rwx /srv/project_files

Question 4

A user needs to change the ownership of a file named `report.txt` from the current user `alice` to the user `bob` and also change its group ownership to `editors`. Which of the following is the most efficient single command to achieve this?

Accepted Answer

chown bob:editors report.txt

Answer

chown bob report.txt && chgrp editors report.txt

Answer

setowner bob:editors report.txt

Answer

chmod bob:editors report.txt

Question 5

A system administrator is configuring a world-writable directory at `/var/shared/uploads`. To prevent users from deleting files they do not own, which permission should be set on the directory?

Accepted Answer

sticky bit (1000)

Answer

setgid (2000)

Answer

setuid (4000)

Answer

read-only (0444)

Question 6

A user has a shell script `backup.sh` with permissions `-rw-r--r--`. When they try to execute it using `./backup.sh`, they receive a 'Permission denied' error. Which `chmod` command will grant the necessary permission with the least privilege required?

Accepted Answer

chmod u+x backup.sh

Answer

chmod 755 backup.sh

Answer

chmod a+x backup.sh

Answer

chmod u+w backup.sh