Managing File Ownership and Permissions

Question 1

chown command

Answer 1

Change ownership of a file
chown user file

Question 2

chgrp command

Answer 2

Change group of a file
chgrp group file

Question 3

Sticky Bit

Answer 3

Special flag on a directory, so a user may only delete their own files or files stored in a directory

Question 4

Set User ID (SUID)

Answer 4

• Special permission bit
• Tells Linux to run the program with root permissions
• Indicated by an S in the owner’s execute permission bit (rws instead of rwx)

Question 5

Set Group ID (SGID)

Answer 5

• Special permission bit
• Set the group of the running program to the group of the file
• Indicated by an S in the group execute permission bit (rws instead of rwx)

Question 6

How to hid a file in Linux

Answer 6

Adding (.) in front of a file hides the file

Question 7

As file owner can give permission

Answer 7

Only to other users in their group

Question 8

ls -l file

Answer 8

List contents of a directory plus:

• Permissions
• Number of links
• Username
• Group name
• File size
• Time stamp
• File name

Question 9

Set sticky bit?

Answer 9

• chown
• Prefix octal code with 1 (0 off)
• chown o+t (o-t off)

Question 10

Set SUID or SGID with Octal Code

Answer 10

• Proceed wtih 2, 4, or 6
• 2 = SGID (group)
• 4 = SUID (owner)
• 6 = Both
• 4766

Question 11

umask command

Answer 11

Used to change the default permission for files and directories at the time of the file’s creation.