1. File Security

2. Viewing Permissions ls –l

3. Permission Values

4. Permissions First character indicates file/directory 3 char. rwx User (Owner) permissions 3 char. rwx Group permissions 3 char. rwx Other (Public) permissions Permission Order of Precedence 1. User 2. Group 3. Other

5. Permission Examples

6. Permissions In Action

7. Default Permissions

8. The chmod Command Use chmod to change permissions on a file or directory. Two modes of operation –Relative (Symbolic) –Absolute (Octal)

9. chmod Symbolic Mode

10. chmod Octal Mode

11. Octal Values

12. Octal Default Permissions Default file permission –644 –rw-r--r-- Default directory permission –755 –rwxr-xr-x