LFCS Filesystem Permissions and ACLs Questions and Answers

Question 1

A developer needs to set the permissions on a shell script named `deploy.sh` using symbolic notation.
The owner should have read, write, and execute permissions, the group should have read and execute permissions, and others should have no permissions.
Which of the following commands correctly applies these permissions?

Accepted Answer

chmod u=rwx,g=rx,o= deploy.sh

Answer

chmod u=rwx,g=r,o-rwx deploy.sh

Answer

chmod 750 deploy.sh

Answer

chown u=rwx,g=rx deploy.sh

Question 2

Which octal value represents the file permissions `rwxr-x---`, granting read, write, and execute to the owner, read and execute to the group, and no permissions to others?

Accepted Answer

750

Answer

650

Answer

751

Answer

740

Question 3

A file named `/data/report.docx` is owned by the user `admin` and the group `editors`. A user named `intern`, who is not a member of the `editors` group, needs to be granted read and write access to this specific file. Which command will accomplish this without changing the file's primary ownership or permissions?

Accepted Answer

setfacl -m u:intern:rw /data/report.docx

Answer

chown intern /data/report.docx

Answer

chmod g+rw /data/report.docx

Answer

setfacl -a user:intern:rw /data/report.docx

Question 4

After modifying a file's permissions with `setfacl`, a system administrator wants to verify that the Access Control List has been applied correctly. Which of the following commands is used to display the full ACL for a file or directory?

Accepted Answer

getfacl

Answer

showfacl

Answer

ls -la

Answer

acl --show

Question 5

A system administrator sets the `setgid` permission (chmod g+s) on a directory named `/srv/collaboration`. What is the primary effect of this permission on new files and subdirectories created within `/srv/collaboration`?

Accepted Answer

New files and subdirectories will inherit the group ownership of the parent directory.

Answer

It prevents anyone other than the file owner from deleting files within the directory.

Answer

All new files created in the directory will automatically be executable by the group.

Answer

Only members of the directory's group can create new files in it.

Question 6

A security policy requires that all new non-executable files created by users have permissions of `rw-r-----` by default. What `umask` value should be set in the shell environment to enforce this policy?

Accepted Answer

026

Answer

022

Answer

002

Answer

027