Types of Operating Systems

OS is a system software which manage the computer hardware.
It provides basis for application software and it act as intermediary between user and computer hardware.
Types:
1.Command Line OS
2.Graphical User Interface OS

Command Line OS:
User interaction with computer by using commands and the response according to the respective command!
Eg: Disk Operating Systems (DOS)
Graphical User Interface OS:
User interaction with computer by using mouse and keyboard.
Eg: Windows OS, Linux,Unix,Mac.
Different versions of OS:
1.Microsoft Windows:
First version of Windows OS released in 1985 and most widely used are

• Windows 8*
• Windows 7
• Windows Vista
• Windows XP

2.Apple Mac OS
In 1984 launch a Macintosh Personal Computer and the Mac first version released in 1999.
Versions are:

• Mac OS X Server 1.0 (Hera)
• Public Beta (Kodiak)
• Mac OS X Version 10.0 (Cheetah)
• Mac OS X Version 10.1 (Puma)
• Mac OS X Version 10.2 (Jaguar)
• Mac OS X Version 10.3 (Panther)
• Mac OS X Version 10.4 (Tiger)
• Mac OS X Version 10.5 (Leopard)
• Mac OS X Version 10.6 (Snow Leopard)
• Mac OS X Version 10.7 (Lion)
• Mac OS X Version 10.8 (Mountain Lion) 

3.Unix OS:
Its a self contained, multitasking and multi user OS released in 1969
4.Linux OS:
Its a Open Source OS and which is popular for Server and Desktop OS.
Versions:

• Ubuntu
• Debian
• Fedora
• CentOS
• RedHat
• Freespire