Session Review

Question 1 (104.5-002 / multiple_choice)

In file permissions, what is the octal value of read permission?

Status: Unanswered

Your Answer:

Options:

• 1
• 2
• 4
• 7

Explanation:
Read permission (r) has an octal value of 4 [1].

Question 2 (104.5-005 / multiple_choice)

For a directory, what does execute (x) permission allow?

Status: Unanswered

Your Answer:

Options:

• Reading file contents inside the directory
• Creating files only
• Entering the directory
• Deleting the directory regardless of ownership

Explanation:
On directories, execute permission means permission to enter the directory, though not necessarily list its files [1].

Question 3 (104.5-017 / multiple_choice)

Who can write to the device file 'brw-rw---- 1 root disk ... /dev/sdb1'?

Status: Unanswered

Your Answer:

Options:

• Only root
• Only users in group root
• The owner root and users in group disk
• Everyone

Explanation:
The lesson answer states that the owner (root) and any users of the group disk can write to /dev/sdb1 [1].

Question 4 (104.5-007 / multiple_choice)

For a directory, what does write (w) permission allow when combined with execute?

Status: Unanswered

Your Answer:

Options:

• Viewing hidden files only
• Creating or deleting files in the directory
• Changing the filesystem type
• Reading every file inside the directory

Explanation:
On directories, write permission means permission to create or delete files, but execute permission is also needed to make those changes [1].

Question 5 (104.5-020 / multiple_choice)

Which command sets both SGID on a directory and the sticky bit for others in one command, as shown in the lesson?

Status: Unanswered

Your Answer:

Options:

• chmod 3775 Box/
• chmod g+wxs,o+t Box/
• chmod u+s,g+s,o+t Box/
• chmod 1755 Box/

Explanation:
The lesson explicitly gives chmod g+wxs,o+t Box/ as the one-command solution [1].

Question 6 (104.5-003 / multiple_choice)

In file permissions, what is the octal value of write permission?

Status: Unanswered

Your Answer:

Options:

• 1
• 2
• 4
• 6

Explanation:
Write permission (w) has an octal value of 2 [1].

Question 7 (104.5-014 / multiple_choice)

What would the default permissions for a regular file be if umask is set to 027?

Status: Unanswered

Your Answer:

Options:

• 0640
• 0750
• 0660
• 0644

Explanation:
For regular files, the default base mode is typically 666. Applying umask 027 results in 640. This exact answer is implied by standard Linux umask behavior and referenced by the lesson’s guided exercise on umask [1].

Question 8 (104.5-006 / multiple_choice)

For a directory, what does read (r) permission allow?

Status: Unanswered

Your Answer:

Options:

• Reading the contents of files inside it
• Listing the directory contents such as filenames
• Executing files inside the directory
• Changing file ownership

Explanation:
On directories, read permission means permission to read the directory contents, like filenames [1].

Question 9 (104.5-030 / command_line)

Enter the command that adds SGID to the directory Box and also sets the sticky bit for others in the same command.

Status: Unanswered

Your Answer:

Accepted Answer(s):
chmod g+wxs,o+t Box/

Explanation:
The lesson explicitly provides chmod g+wxs,o+t Box/ as the combined command [1].

Question 10 (104.5-016 / multiple_choice)

In the output 'brw-rw---- 1 root disk ... /dev/sdb1', what type of file is /dev/sdb1?

Status: Unanswered

Your Answer:

Options:

• Character device
• Regular file
• Block device
• Directory

Explanation:
The lesson explains that the first character b indicates a block device, usually a disk [1].