Variable - Alternate name for memory locations
Variable Names
1. Variable name should start with either alphabet or underscore
2. Variable name should not contain any special characters
other than underscore
Scalar Variables
Normal variables are scalar variables
Defining Variable
variable_name=variable_value / expression
Accessing Variables
prefix variable with $
Ex: a=10
$a
Read-only Variable
readonly variable_name
Unsetting Variable
unset variable_name
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