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z/OS MVS JCL Reference
Purpose: Use the EXPORT statement to make specific JCL symbols available to the job step program. Exported JCL symbols can be accessed during the job execution phase using the JCL Symbol Service (IEFSJSYM) or the JES Symbol Service (IAZSYMBL). Symbols must be set to a value subsequent to the EXPORT statement for the symbol value to be exported.
Note: Do not use the EXPORT statement to override the symbol names on the SYMLIST on an EXPORT statement that is inside a procedure.
References: IEFSJSYM is documented in z/OS MVS Programming: Authorized Assembler Services Reference EDT-IXG. IAZSYMBL is documented in z/OS JES Application Programming.
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