Linux Shell Scripting Tutorial Ver. 1.0

Introduction
This tutorial is designed for beginners only and This tutorial explains the basics of
shell programming by showing some examples of shell programs. Its not help or
manual for the shell. While reading this tutorial you can find manual quite useful (
type man bash at $ prompt to see manual pages). Manual contains all necessary
information you need, but it won’t have that much examples, which makes idea
more clear. For that reason, this tutorial contains examples rather than all the
features of shell. I assumes you have at least working knowledge of Linux i.e. basic
commands like how to create, copy, remove files/directories etc or how to use
editor like vi or mcedit and login to your system. Before Starting Linux Shell Script
Programming you must know
Kernel l
Shell l
Process l
Redirectors, Pipes, Filters etc. l
What’s Kernel
Kernel is hart of Linux O/S. It manages resource of Linux O/S. Resources means
facilities available in Linux. For eg. Facility to store data, print data on printer,
memory, file management etc . Kernel decides who will use this resource, for how
long and when. It runs your programs (or set up to execute binary files) It’s
Memory resident portion of Linux. It performance following task :-
I/O management l
Process management l
Device management l
File management l
Memory management l
What’s Linux Shell
Computer understand the language of 0′s and 1′s called binary language, In early
days of computing, instruction are provided using binary language, which is difficult
for all of us, to read and write. So in O/s there is special program called Shell. Shell
accepts your instruction or commands in English and translate it into computers
native binary language.