Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

The IBM_SORT_DIR environment variable

When you specify the IBM_SORT_DIR environment variable, temporary work files are saved in the directory you have specified instead of the current directory, for example:

export IBM_SORT_DIR=/tmp
Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide