21. A computer program product for generating a parameter value for an executable statement, comprising: a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising: computer readable program code configured to identify, in the plurality of program statements, an input statement, wherein the input statement comprises input information; computer readable program code configured to identify, in the plurality of program statements, an output statement associated with the input statement; wherein: the output statement comprises a reference to a temporary data set, and another of the plurality of program statements also includes a parameter reference to the temporary data set; computer readable program code configured to modify the input information by performing symbolic substitution on at least a portion of the input information to produce modified input information; and computer readable program code configured to output according to the output statement the modified input information to the temporary data set.
21. A computer program product for generating a parameter value for an executable statement, comprising: a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising: computer readable program code configured to identify, in the plurality of program statements, an input statement, wherein the input statement comprises input information; computer readable program code configured to identify, in the plurality of program statements, an output statement associated with the input statement; wherein: the output statement comprises a reference to a temporary data set, and another of the plurality of program statements also includes a parameter reference to the temporary data set; computer readable program code configured to modify the input information by performing symbolic substitution on at least a portion of the input information to produce modified input information; and computer readable program code configured to output according to the output statement the modified input information to the temporary data set. 22. The computer program product of claim 21 , wherein the plurality of program statements comprise JCL statements.