Chapter 5

1. Which three permissions are used for Linux files?
   • Read
   • Write
   • Execute
2. Which three types of ownership are defined for Linux files?
   • User
   • Group
   • Others
3. Which command is used to change the permissions on a file?
   chmod
4. What mechanism controls the default permissions for newly created files?
   umask
5. How is the following symbolic permission described in octal: rwxrw-r--
   0764. 7 from rwx on the first three places (user), 6 from rw- on the second three places (group), and 4 from r-- on the last three places (others).
6. How is the following octal permission described symbolically: 0644
   rw-r--r--. First 6 is ReadWrite, then two 4s which are just Reads.
7. Which command allows us to gain superuser privileges?
   sudo
8. Which commands can we use to change ownerships for a file?
   • chown
   • chgrp
9. How can we arrange for multiple users to share access to files?
   We make sure they share group membership...