Answer Posted / stu

DISP=(xxx,yyy,zzz) where

xxx=how the file is treated by your program. New=create,
SHR=exists, share with other jobs, OLD=exists, lock it
while the program uses it, MOD=it may exist, but if it
doesn't, create it.

yyy=what to do with the file if the jobstep completes
successfully. CATLG=catalogue a new file, KEEP=keep the
file with any changes made by the program, DELETE=delete it.

zzz=what to do with the program if the jobstep does not
complete successfully. CATLG=catalogue a new file,
KEEP=keep the file with any changes made by the program,
DELETE=delete it.

Example:
DISP=(NEW,CATLG,DELETE) will create a new file, catalgue and
keep it if the jobstep completes OK; otherwise delete it
without cataloging.

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