Introduction to UNIX

UNIX

UNIX- Uniplexed Information and Computing Service

          Unix is a CUI operating system.

History of UNIX:

                Before development of UNIX OS at AT&T BELL laboratory. A software team lead by Kenn Thomson, Dennis M Ritchie and Rudd candy worked on MULTICS (Multi Information Computing System). But MULTICS- Share the data only for 2 users.

Later in 1969 UNICS(Uniplexed Computing System) was developed.

UNICS- Share the data for 100’s of users

Later in 1973, they C language named an UNIX.

UNIX- Share the data for millions users.

Features of UNIX:

• ·         Multi user capability
• ·         Multi tasking capability
• ·         Programming facility.
• ·         Portability
• ·         Communication(Electronic mail )
• ·         Security
• ·         Open system
• ·         System calls
• ·         Help facility

Architecture of UNIX system:

Shell:

                The shell reads your data interprets it and execute   it, Shell acts as interface between user and the computer.

Kernel:

                The kernel schedules the tasks and manages the memory. Which is the heart of the o/s which is directly interacts with the hardware.

·         

•           Manages the computer memory
• ·         Control the access to the computer
• ·         Maintain the file system
• ·         Handle interrupts
• ·         Perform i/p and o/p services
• ·         Allocates the resources