Operating System
What is Operating System
An operating system (OS) is a collection of software
that manages computer hardware resources and
application programs and provides common services for
computer programs.
Eg:
MS-Windows
MS-DOS
UNIX
MAC-OS etc
Program Execution
 Operating systems provides an environment where
the user can conveniently run programs. Operating
system takes care of the chores like memory
allocation or multitasking or anything. Relieving the
user from this burden.
I/O Operations
 The operating systems hides the user the details of
underlying hardware for the I/O.
 All the user sees is that the I/O has been performed
without concern by the user of the underlying details.
File System Manipulation
• The reading and writing to/from a file involves the
exchange of information to/from secondary storage
devices.
• The operating systems here makes it easier for user
programs to accomplished their task that involves
the services of secondary storage management.
Communications
• Operating systems helps communication between
processes , when they need to exchange information.
• The processes may be on the same computer or on
the different computers.
Error Detection
 An error may cause a failure in the functioning of
system.
 Operating system constantly monitors the system for
detecting the errors, their level and severity and takes
appropriate actions according to the error.