There is one required DD name and two optional DD names for IRXJCL. There are many different ways to define REXX data sets. Refer to the TSO/E REXX Reference manual for more information.
| IRXJCL | |||||
| DD | Description | Access Method | LRECL | BLKSIZE | RECFM |
| SYSEXEC | A PDS/PDSE library that contains the REXX exec to invoke. There are many different ways to define REXX exec libraries. REXX supports fixed or variable length record formats (RECFM), various record lengths (LRECL), and all block sizes (BLKSIZE) that support the desired record format and length. The default REXX exec DCB characteristics are listed here. | QSAM | 80 | 8800 | FB |
| SYSTSIN | This is an optional DD statement which is used to provide an input stream for the REXX exec. | QSAM | 802 | SMS1 | FB3 |
| SYSTSPRT | This is an optional DD statement which is used to provide an output stream for the REXX exec. This DD will contain output and messages produced by the REXX exec including TRACE output and error messages. | QSAM | 802 | SMS1 | FB3 |