CIS 527

Lab 1 - Ubuntu File Permissions

Linux File Permissions

• Classes
  • User - owner of the file
  • Group - group assigned to file
  • Others - other users
• Permissions
  • Read - read file contents
  • Write - change/delete file
  • Execute - run program or script & list folder contents

File List

Image Credit: Digital Ocean

File Modes

Image Credit: Digital Ocean

Octal Permissions

Image Credit: Just Enough Linux

Common Octal Values

Image Credit: Linode

Modifying Permissions

• File Browser (Nautilus)
• Edit as Administrator (Using "nautilus-admin")
• Terminal

Terminal Commands

• chmod - Change Permissions (Mode)
  • chmod [class][op][mode] <path>
  • chmod [ugoa][+-=][rwx] <path>
  • chmod [octal_mode] <path>
• chown - Change Owner
  • chown [user]:[group] <path>
• chgrp - Change Group
  • chgrp [group] <path>
  • Must Own File

Next Step!

Start Lab 1, Task 6:

Ubuntu Files & Permissions