A JES job data set is a dataset that is part of a JES job.
For parameter input, a JES job data set is identified by either its name from the ddname label of a Job Control Languange DD statement or by a JES-assigned data set number. If the data set name is entered, it may be qualified by entering it in the form stepname.ddname. If the step qualification is not provided, and the data set name is not unique with the job, the identification refers to the first instance of the dataset. The name can also be one of the JES pre-defined names, of which the most useful is $JCL, which contains the Job Control Language for the job. JobInquire can be used to display for a particular job a list of data sets and their associated data set numbers.
The following are valid JES job data set identifications:
$jcl
(job control language)
1
(data set number 1)
sysin
(sysin data)
comp.sysin
(sysin data for step=comp)