BATCH SCRIPTING // STRINGS IN BATCH SCRIPT // Batch Scripting Part- 10 - STRINGS
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Title: BATCH SCRIPTING // STRINGS IN BATCH SCRIPT // Batch Scripting Part- 10 - STRINGS
In this lesson, you will be learning about STRINGS in Batch Script.
In DOS, a string is an ordered collection of characters, such as "Hello, World!".
CREATE STRING: A string can be created in DOS in the following way.
Example
@echo off
set message = Hello World
echo %message%
Output
Hello World
EMPTY STRING: An empty string can be created in DOS Scripting by assigning it no value during it’s initialization as shown in the following example.
Set a=
To check for an existence of an empty string, you need to encompass the variable name in square brackets and also compare it against a value in square brackets as shown in the following example.
[%a%]==[]
The following example shows how an empty string can be created and how to check for the existence of an empty string.
Example
@echo off
SET MESSAGE=
SET BUNT=Hello
if [%MESSAGE%]==[] echo "String MESSAGE is empty"
if [%BUNT%]==[] echo "String BUNT is empty "
Output
The above command produces the following output.
String MESSAGE is empty
STRING INTERPOLATION: String interpolation is a way to construct a new String value from a mix of constants, variables, literals, and expressions by including their values inside a string literal.
In DOS scripting, the string interpolation can be done using the set command and lining up the numeric defined variables or any other literals in one line when using the set command.
The following example shows how a string interpolation can be done with numeric values as well.
Example
@echo off
SET a = Hello
SET b = World
SET /A d = 50
SET c=%a% and %b% %d%
echo %c%
Output
The above command produces the following output.
Hello and World 50
STRING CONCATENATION :You can use the set operator to concatenate two strings or a string and a character, or two characters. Following is a simple example which shows how to use string concatenation.
Example
@echo off
SET a = Hello
SET b = World
SET c=%a% and %b%
echo %c%
Output
The above command produces the following output.
Hello and World
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