OS

im so cooked

Operating System

essential software that helps with:

• User management

• memory management

• file management

• process management

• computer system management

• hardware management

• application management

• links hardware/software management

software

computer programs

hardware

physical components of your computer

application software

• benefits users

• word processors

• browsers

  • games

system software

• tasks needed to operate hardware

• services to other software

• OS

• game engines

• utility programs

  • encryption

  • backup

Command Line Interface

shell that responds to text commands. Direct and compact.

Graphical User Interface

icons/visual indicators to navigate/issue commands. Easy to use.

interrupt

stops what the process is doing, because there’s something more important (e.g. your computer turns off)

How does the OS manage hardware?

only the OS can interact directly with it

what applications does the OS manage?

utility software

How does the OS create a user interface? (idk how to word this)

• abstracts from hardware (ignores things we don’t need)

• different UIs include:

  • CLI

  • GUI

How does the OS manage processes?

• gives CPU time for each process/in order of priority

single tasking OS

• executes one program at a time

  • stops with interrupts if needed

Multitasking OS

• execute 1 program at a time

• allows many apps to run by switiching in between processes

• looks like multitasking, but it’s not

How does the OS manage peripherals?

• supplementary hardware (keyboards, printers, cameras)

• device drivers

  • programs that convert peripheral signals → OS signals

  • interfaces, they hide the complicated bits of hardware

How does the OS manage users?

• users, passwords, accounts

• multi-user OS has account controls

How does the OS manage files?

• records files/location/permissions