Batch Script - Empty String
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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 a= SET b = Hello if [%a%]==[] echo "String A is empty" if [%b%]==[] echo "String B is empty "
Output
The above command produces the following output.
String A is empty
batch_script_strings.htm
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