This is passed when a job is scheduled in SAS Management Console using the -LOG option. If you are not scheduling but running sasbatch.sh manually you might need to just add the -log option pointing to the path and your job name. The batch server's logconfig.xml should append a datestamp and ".log" to that. So for example when you deploy a job in SAS Management console the command it builds looks like this:
<path-to-BatchServer>/sasbatch.sh -log <path-to-BatchServer>/Logs/<JobName>_ -batch -noterminal -logparm "rollover=session" -sysin <path-to-SAS-program>
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Greg Wootton | Principal Systems Technical Support Engineer