Page 150 - DCAP602_NETWORK_OPERATING_SYSTEMS_I

Network Operating Systems-I Manmohan Sharma, Lovely Professional University

notes unit 8: shell

contents
Objectives
Introduction
8.1 Different Types of Shells

8.1.1 BASH (Bourne-again Shell)
8.1.2 C Shell (csh)
8.1.3 Korn Shell (ksh)
8.1.4 TCSH
8.2 Common Shell Commands

8.3 Summary
8.4 Keywords
8.5 Self Assessment
8.6 Review Questions

8.7 Further Readings

objectives

After studying this unit, you will be able to:
l z Discuss different types of shells
l z Understand common shells commands

introduction

Computers understand the language of zeros and ones known as binary language. In the early
days of computing, instructions were provided using binary language, which is difficult for all of
us humans to read and write. Therefore, in an operating system there is a special program called
the shell. The shell accepts human readable commands and translates them into something the
kernel can read and process.
It is a command language interpreter that executes commands read from the standard input
device (keyboard) or from a file. The shell is a user program or it is an environment provided for
user interaction.

Shell is not part of system kernel, but uses the system kernel to execute programs, create files
etc.

144 LoveLy professionaL university