Generally, operating systems are separated into Unix and non-Unix.
Some examples:
Unix:
There are basically four types of operating systems. They include Batch Operating System, Multiprogramming Operating System, Network Operating System and Distributed Operating System.
There are two types of OS as follow:- Desktop Operating System- Network Operating System
Jobs with similar needs are batched together and run through the computer as a group.
Main Types of operating system are WindowsMac OSLinuxSun Solaris
operating system is a control program as it allow multiple task to performed on same window.
What exactly do you mean by 'optimal operating system'? If you don't define the term there is no way to answer the question.
types of devices in operating system
User Rights
DOS is short for disk operating system.
States define an exact operating condition of a system, where modes define the set of capabilities or functions which are valid for the current operating condition. (Source: http://themanagersguide.blogspot.com.au/2011/01/6322-define-life-cycle-system-modes.html)
The operation system is an integrated set of programs that control,supervises and supports a computer system.Operation system make the computer easier to use,because the machine and its operator.this entire collection of system software programs is known as an operating system. The types of operating system is 1)Processor scheduling 2)Memory management 3)I/O management 4)File management
Operating system software .....OPERATES !! and utility software....UTILIZES !! ..now go do your research .