OPERATING SYSTEMS

OPERATING SYSTEMS

1. EXAMPLES OF OPERATING SYSTEMS

   • MICROSOFT WINDOWS
   • IOS
   • LINUX
   • ANDROID
   • MAC OS

2. DEFINITION

   • A COLLECTION OF PROGRAMS THAT MANAGERS THE HARDWARE ANDS SOFTWARE OF A COMPUTER SYSTEM, INCLUDING SHARING THE COMPUTER'S TIME, MEMORY, HARDWARE AND OTHER RESOURCES.

3. FUNCTIONS OF THE OPERATING SYSTEM

   • SOFTWARE MANAGEMENT
     • CREATES A FILE SYSTEM TO ORGANISE FILES AND DIRECTORIES. THIS IS CALLED A HIERACHY
     • PROVIDES A USER INTERFACE SO IT IS EASY TO INTERACT WITH THE COMPUTER
   • HARDWARE MANAGEMENT
     • OPENS, CLOSES AND WRITES TO PERIPHERAL DEVICES SUCH AS STORAGE ATTACHED TO THE COMPUTER.
       • DRIVERS - SOFTWARE THAT IS USED BY THE OS TO CONTROL THE DEVICE.
     • TRANSFERS PROGRAMS INTO AND OUT OF MEMORY, ALLOCATES FREE SPACE BETWEEN PROGRAMS, AND KEEPS TRACK OF MEMORY USAGE.
   • USER MANAGEMENT
     • GRAPHICAL USER INTERFACE (GUI) IS AN INTERFACE WHERE THE USER INTERACTS THROUGH IMAGES THROUGH A MOUSE,, KEYBOARD OR TOUCHSCREEN.
     • COMMAND LINE INTERFACE (CLI) IS A NON-GRAPHICAL INTERFACE AND IS A TEXT-ONLY SERVICE.
     • PROVIDES SECURITY THROUGH PASSWORDS AND USERNAMES.

4. PROCESS MANAGEMNENT

   • MANAGES THE CPU - RUNS APPLICATIONS AND EXECUTES AND CANCELS PROCESSES.
   • ALLOWS MULTIPLE APPLICATIONS TO RUN AT THE SAME TIME.

5. UTITLITIES SOFTWARE

   • APPLICATIONS WHICH ALLOW THE USER TO MANAGER THE COMPUTER SUCH AS DELETING DATA, SOFTWARE UPDATES AND ANTI-VIRUS SOFTWARE.

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