START command processing when the member is a job
If a JOB statement is the first statement in the member, the system
uses the JCL provided in the member. For example, given the following
JOB statement and JCL in the INIT member:
//INIT JOB 'accounting_info',MSGLEVEL=1
//JESDS OUTPUT JESDS=ALL,OUTDISP=(PURGE,WRITE)
//INIT EXEC INIT
//DD1 DD DSN=SYSTEM.ACCOUNT.DATA,DISP=SHR
//*
JES2 automatically issues the command S INIT.INIT,,,JES2,SUB=JES2 and the preceding JCL is invoked, starting the MVS™ initiator by calling the INIT procedure. The S INIT.INIT,,,JES2,SUB=JES2 command now uses the source JCL and invokes the same procedure.