Operating Systems

Operating Systems

1. A collection of programs that manages the hardware and software of a computer system, including sharing the computers memory, time, hardware and other resources.

2. File management

   • Creates a file system to organise files and directories
     • Hierarchy of directories

3. Hardware management

   • Manages peripherals - opens, closes and writes to peripheral devices such as storage attached to the computer
     • Drivers are software that is used by OS to control the device
   • Manages memory - transfers programs into and out of memory, allocates free space between programs, and keeps track of memory usage

4. User management

   • User interface
     • Graphical user interface (GUI)
       • The OS on most computers and smartphones provides an environment with tiles, icons and/or menus
     • Command line
       • An OS also provides a method of interaction that is non-graphical, called the command line interface (CLI).
   • Security- Provides security through, user accounts and passwords

5. Process management

   • manages the CPU - runs applications and executes and cancels processes
   • multi-tasks - allows multiple applications to run at the same time

6. Utilities software

   • Deleting data
   • Anti-virus software
   • firewall

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