REXX is probably your best bet, but in the 1970s and 1980s, REXX wasn't
available on MVS and I often used the AREAD capability of ASMH (also
available in HLASM) to generate job streams. See example below (it's
been a while, correct syntax is NOT guaranteed):
MACRO
JPUNCH
.LOOP ANOP
AREAD &CARD
AIF ('&CARD' EQ '').EOJ
PUNCH '&CARD'
AGO .LOOP
.EOJ END
MEND ---------------
JPUNCH , <---------- execute macro and read data cards
PFX TUSER.HH
RST ADCD.A.CNTL
RST ADCD.LIB.JCL
/*
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