1. Operating Systems Programs for performing surgery NOT! –Sorry I got carried away

2. Operating Systems Program that starts when you turn on your computer Controls devices (printers, disk drives, displays, networks) manages information in files and folders runs other programs

3. Example Operating Systems Microsoft Windows –Windows 98 –Windows 2000 –Windows XP UNIX –Linux (Open Source) –HPUX (Hewlett-Packard) –AIX (IBM) –Solaris (Sun) MacOS (Apple)

4. How are they the same? They have files They have folders or directories They run programs

5. How are they different? The user interface The things that a user must do to work with files, folders and programs

6. Managing Information Find files Look at the contents of files Organize your files and folders Create and delete files and folders Printers and disks

7. What is a File? An array of bytes What do those bytes mean? –Depends on the type of file Word, Excel, Gif, HTML, Jpg, VRML, Java

8. Finding files By Address - –every file has a particular address on a particular disk drive –We don’t want to know By Name –Pathname in a tree of folders (directories) and files By Search

9. Files, Folders and Names Root of the tree

10. Files, Folders and Names Disk where my files are stored

11. Files, Folders and Names

14. Path name

15. Files, Folders and Names Up the tree

16. Files, Folders and Names Up the tree

17. Files, Folders and Names Up the tree

18. Files, Folders and Names

19. Files by Search Do a search Folder to search in Partial name to search for

20. Files by Search Files and Folders Found Pathnames of where they are in the tree

21. Other Searches Content text rather than name

22. Other Searches By the date last modified Censored

23. Viewing a File To look at a file we must run another program Run the program on double-click Which program will the OS run? –Depends upon the type of the file –How do we know the type of the file?

24. File Types Folders PowerPoint Slides Microsoft Word How does the computer know the file type?

25. Showing File Extensions

28. An extension is at the end of the file name Each extension has a program associated with it –.ppt => PowerPoint –.doc => Word

29. Showing File Extensions Each extension has a program associated with it –.html => Netscape –.gif => Photoshop –.txt => Notepad

30. How do extensions get attached to programs? When the program is installed on your computer

31. File Extensions - just a record Many extensions can map to the same program

32. Organizing Files Create a Folder

33. Organizing Files Naming a file or Folder –Click -> click on the name -> type new name

34. Organizing Files Deleting a file or folder Drag to Recycle

35. Deleted files are not really gone

36. Recycle Bin is just a special folder

37. Other Devices CD-ROM, ZIP, Network

38. What is a Program? A special file with extension.EXE

39. OS Running a program Reads the bytes from the file Places the bytes into memory Tells the computer to start running the instructions in those bytes

40. Operating Systems Review Everything is just a big tree –Files –Folders OS has record with a program name stored under each extension name A program is just a file filled with instructions for the computer