Operating Systems: UNIX, Linux, Android, Windows Server (2012)

Running Head: OPERATING SYSTEMS
Operating Systems
Name of Student-
Name of University-
Author’s Note-

1OPERATING SYSTEMS
Table of Contents
1. UNIX Operating System..................................................................................................1
2. Linux Operating System..................................................................................................2
3. Android Operating System..............................................................................................4
4. Windows Server (2012) Operating System.....................................................................6

2OPERATING SYSTEMS
1. UNIX Operating System Design Goals
The need of UNIX Operating Systems are they provide an interface that is controlled by
the user and the applications they have (Spinellis, Louridas & Kechagia, 2016). The UNIX OS
also controls computer hardware and controls process for execution which provides operation for
the purpose of creation, termination and suspension. UNIX OS provides mechanism that are user
to process and provides inter-process communication. This OS provides resources and also
avoids deadlocks and starvation. It manages the secondary memory by file system. Memory Management
Managing of memory is very important to OS in a computer system. Memory
Management of UNIX OS is managing the memory of the computer that consists of primary and
secondary memory (Stevens & Rago, 2013). The UNIX OS memory management is to track the
parts of total memory that are used and the memory that is not used. It is also used to allocate the
memory of all the processes when the memory is needed to be allocated and again de-allocate
them when the work is done. The schemes that are included in UNIX memory management are
swapping and also demand paging. Unix OS also performs memory management by dividing the
main memory to multiple partition of logical spaces. It follows mainly two types of memory
partition. Single partition allocation and allocation of multiple partitioning. Processor Management
The process that are involved in UNIX OS is executing program or executing command.
The process of UNIX performs program and command. Creation of process is done every time

3OPERATING SYSTEMS
when an UNIX program and command is run from command line. For instance, when a
command ls is executed in the OS, single process is being created so that the list of contents of
working directory is listed. User Interface
The user interface (UI) mainly refers the software which allows a user to accomplish
interaction with computer. The work of User Interface is to look at the system and feel the
system. The UI determines the way about how efficiently and easily the work can be done.
UNIX means API but does not ensure a particular User Interface (Silberschatz, Galvin & Gagne,
2014). There are many user interface for UNIX system. The UNIX system mainly has Graphical
User Interface (GUI) as its UI that provides to use the environment easily.
 Security of UNIX
There is no such security that is related with UNIX OS. From the invention of UNIX OS
20 years before, this operating system was mainly used by professionals of computer and at that
time computer crime was rare. The UNIS system is unsafe to use.
2. Linux Operating System Design Goals
The Operating System of Linux supports the basic functions of the computer. This
includes scheduling of tasks, controlling peripherals and executing applications (Peter et al.,
2016). This is a system which controls allocation and also uses hardware resources that includes
CPU time, memory, output and input devices and the disc space. The main design goals of Linus
Operating System are efficiency, standardization and speed.