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OPERATING SYSTEM: -
An Operating System is the Software that manages the computer’s hardware and provides a convenient
and safe environment for running programs and hardware resources that these programs like Memory,
hardware and printer.

Function of O.S: -
 Process Management
 Memory Management
 Data Management
 I/O Management

LINUX ARCHITECTURE: -

USER
OTHER PROGRAM
SHELL

KERNEL
HARDWARE

KERNEL: -
 It is the interface between H/W devices and Shell.
 It is a Set of Function that makes up the heart of an O.S.
 It controls the execution process, scheduling process fairly for execution on the CPU.
 Allocating memory for an execution processes.

SHELL: -
 Shell is the Interface between the user and the Kernel.
 It is the command Interpreter to kernel
 The kernel after processing the commands gives back to the Shell.

History of Unix

MULTICS Started in 1995 by AT & T, GE and MIT

UNICS Created by Ken Thompson in 1969

UNIX Written in 100% c Language and released in 1973

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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