Apple OS X
Unix
Linux
VAX/VMS
OS4000
IBM System/360
DOS
IBM OS/2
RISK OS
Free RTOS
OS 2200
Exec 8
(There are lots more)
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Simply because they were the first affordable system, created by a well known company, and it is the most commonly used OS.
No, Operating system is not resposible for file compression. It is the task of utilities that come bundled with OS or installed by you. Some well known utilities are 7-zip, WinZip, WinRar, etc.
Because if it was, the system would be MUCH more prone to crashing(also known as Microsoft Windows).Actually, a shell IS part of an operating system. "Operating System" encompassing not just the kernel, but also a standard set of utilities and libraries which provide a defined API.For example, the UNIX Operating system include the Bourne Shell as a part of its specification, as well as a specific C library, and filesystem utilities such as 'ls', 'grep', etc.Obviously, as there a large number of shells around, a specific shell may NOT be part of a specific Operating System.
An assembler must be specifically written to accommodate both the operating system, as well as the underlying CPU architecture.
Software that includes an operating system as well as utilities is called an operation system package. Two examples of this type of software system are Windows and Linux.