BEST SHELL SCRIPTING

COURSE

B E S T O N L I N E C O U R S E S C O U P O N . C O M

PRESENTATION

OVERVIEW

About Shell Scripting

Variables in Shell Scripting

Variable declaration

Unix Shell Scripting Contents

Standard wildcard

Loops in Shell Scripting

Types of loops

Test-driving Shell Scripts

Call A Function In Shell Scripting

External Programs

Interactive Shell Scripts

ABOUT SHELL

SCRIPTING

A shell script is known as the human readable

text file which mainly contains the collection of

commands.

It can also be manually executed step by step at

the UNIX operating system.

Thus the vi program or any of the UNIX editors

out there which can be mainly used to create

the shell script and store it to the disk for

execution.

VARIABLES IN  SHELL

SCRIPTING

Variables are the primary process of any script or the

program.

It is an easy way to check out the amount of the data

in memory which can be mainly modified.

Thus the variable in a different script can be allotted

any values like a number or the text string.

VARIABLE

DECLARATION

For the information in the field of UNIX to

create the variable one must place in the

script.

“VARIABLE_NAME=value”

Hence the VARIABLE_NAME will be

anything the user wants, and it also

contains the letters, numbers as well as

“_.”

UNIX  SHELL SCRIPTING

CONTENTS

It is very useful in various ways for the many users as

well as Linux system.

Thus the commands can use the wildcards to performing

the action on file which is said to be the more than a file

at a time.

The users should know that there are two different ways

are used for the Wildcards.

STANDARD WILDCARD 

T h e y a r e s t a n d a r d w i l d c a r d w h i c h i s o f t e n

u t i l i z e d b y t h e s h e l l w h e r e a s t h e

a l t e r n a t i v e i s t h e g e n e r a l e x p r e s s i o n s o n

t h e o t h e r s i d e i t i s f a m i l i a r w i t h t h e m a j o r

c o m m a n d s f o r u s e w i t h m a n i p u l a t i o n a n d

t h e t e x t s e a r c h i n g . F o r e x a m p l e , i f t h e u s e r

w a n t s t o c r e a t e a f i l e f o r “ p r o c e s s ” w i t h

w i l d c a r d e x p r e s s i o n s t h e n c r e a t e i t a s

‘ p r o c e s s * .

LOOPS IN SHELL

SCRIPTING

The loop is said to be the powerful tool which is

mainly enabled to run the set of commands

continuously.

Thus the while loop is mainly executing the

commands which are given until the condition

remains genuine and until loop will repeatedly

execute until the given condition is true.

 TYPES OF LOOPS

There are different types of loops available

in the shell. They are

1) While Loop

2) For Loop

3) Until Loop

4) Select Loop

TEST-DRIVING

SHELL SCRIPTS

The test command from the UNIX which

primarily evaluates the expression of the

parameter.

In most of the past shell implementations,

that is the shell builtin where the external

version also mainly exists.

The second form of the command like

brackets will be surrounded by the blank

spaces.

The user must help to test the explicitly

for the file names in the shell.

CALL A FUNCTION IN

SHELL SCRIPTING

Thus the function is mainly enabling the user to

break down the entire functionality of the script.

converted to logical subsections, smaller and

then it can be called as to perform the specific

tasks if they need.

Thus the function is mainly used to carry out the

continuous tasks in an excellent way of creating

the code reuse.

EXTERNAL PROGRAMS

The external programs are mainly used for

the shell scripts, and there are few

building commands like a test, which and

echo are typical. On the other side, one

must know that the commands are said to

be the UNIX utilities they are cut, expr,

grepa and tr. Thus the backtick is usually

connected often with the external

commands.

INTERACTIVE SHELL

SCRIPTS

An interactive shell primarily interacts

with the user input and the user.

Thus the user types of input where the

script mainly validates the input to

make sure which it belongs to the

correct format.

Once the validating is complete with the

input, the shell script will directly make

text processing on the string.

SHELL SCRIPTING

COURSE

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