//JOB1 JOB ,'W. BAILEY',MSGCLASS=B,BYTES=(30,DUMP)
//STEP1 EXEC PGM=TESTPGM
//SYSUDUMP DD SYSOUT=D
.
.
. If the first step exceeds 30,000 lines of output, the system cancels the job and writes a SYSUDUMP dump to the sysout data set for class D.