1. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Understanding the Linux Directory Structure Instructor: Joseph DiVerdi, Ph.D., MBA

2. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Why Bother with this Topic? In this class you will create a public web site –Remotely-Hosted on a Linux Server –Running Apache Web Server Software This is a very popular configuration & easy to learn If you understand the underlying principles –It will seem less like an exercise in memorization –You will be more effective with the available tools –Your future web site(s) will be more maintainable –You will be a happier person

3. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Linux Directory Structure There are two entities: –directories (called "folders" in a desktop OS) –files Files can exist within directories Directories can exist within directories Directories cannot exist within files Organized as an upside-down tree –root is at the top –Branches increase down the tree

4. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Schematic Directory

5. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Linux Directory Structure We often speak of parent & children directories The root directory has no parent directory Every other directory has exactly one parent directory –Just "above" it on the directory tree Every directory has zero or more child directories –Just "below" it on the directory tree

6. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Schematic Directory

7. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Schematic Directory

8. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Directory Paths A path is a specification which identifies a unique directory –Used when it is necessary to locate a particular file or directory on a host There are two kinds of paths: –absolute path Information supplied is unambiguous & self-contained –12245 JFK Parkway –relative path Information is relative to the entity which is declaring it –Two blocks north & one block east

9. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Absolute Directory Path Must begin with a "/" /users/jen/pers Read: "slash-users-slash-jen-slash-pers" Always starts with root directory

10. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Absolute Directory Path

11. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Absolute Directory Path

12. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Absolute Directory Path

13. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path Must not begin with a "/" users/jen/pers Read: "users-slash-jen-slash-pers" Must be considered relative to the current directory

14. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

15. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

16. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

17. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path What if we wish to move "up" in the directory tree?

18. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

19. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

20. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

21. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path

22. Understanding Linux Directories Fort Collins, CO Copyright © XTR Systems, LLC Relative Directory Path