Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Programming Guide

Associating data sets with files under z/OS UNIX

Using environment variables
Using the TITLE option of the OPEN statement
Attempting to use files not associated with data sets
How PL/I finds data sets
Specifying characteristics using DD_DDNAME environment variables
APPEND
BUFSIZE
CHARSET for record I/O
CHARSET for stream I/O
DELAY
DELIMIT
LRECL
LRMSKIP
PROMPT
PUTPAGE
RECCOUNT
RECSIZE
SAMELINE
SKIP0
TYPE

A file used within a PL/I program has a PL/I file name. A data set also has a name by which it is known to the operating system.

PL/I needs a way to recognize the data set(s) to which the PL/I files in your program refer, so you must provide an identification of the data set to be used, or allow PL/I to use a default identification.

You can identify the data set explicitly using either an environment variable or the TITLE option of the OPEN statement.


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