Introduction to Operating Systems

1. Purpose of an Operating System
   Hardware
   Kernel
   Shell
   Application
   
   
2. Purpose of an Operating System (cont)
   Application Programming Interface (API)
   Device driver
   
   
3. Classifications of Operating Systems
   Single-user, single-task operating systems
   Single-user, multi-task operating systems
   Multi-user systems
   Real-time operating systems
   
   
4. Uses of Operating Systems
   Network routers
   Printers
   DVD players
   Toothbrushes
   Cell phones
   
   
5. Hierarchical filing systems
   
   
6. Absolute path reference
   
   
7. Relative path reference
   
   
8. Absolute and relative paths
   
   
9. Logical/physical representations of files
   Saving a document
   File allocation table
   Mapping data to available sectors
   
   
10. Working with short 8.3 filenames
    Use dir /x to view short filenames
    Converting long to short filenames
    Step 1: Remove invalid characters
    Step 2: Remove additional periods
    Step 3: Truncates the file name, start with six characters and appends a tilde (~)
    Step 4: Truncates the file name extension
    Step 5: Convert to uppercase
    Example: Alongf~1.txt from "A long filename.txt"
    
    
11. Binary and ASCII files
    ASCII files
    Binary files
    The Rosetta Stone effect