Variable processing
A variable is a logical name or reference that may be assigned a value.
Variables are entries within a variable pool or dictionary service that are provided by the JCL script language facility. Most JCL script statements reference variables, and context determines whether the specified variable name or the contents (or value) are assigned the required variable.
An ampersand (&) character is used to prefix a variable name when the content or value of the variable is to be used. The ampersand is omitted when the context of the script statement requires use of a variable name.
LET VARIABLE_NAME = &VALUE_OF_THIS_VARIABLE
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