In the JCL environment, you can use the IRXJCL utility to run a REXX exec.
For example, the following JCL jobstream runs the REXX exec named jcltest in the PDS named userid.rexx.exec that has been allocated to SYSEXEC.
//jobname JOB ............ //* //jobstep EXEC PGM=IRXJCL,PARM='JCLTEST' //SYSEXEC DD DSN=USERID.REXX.EXEC,DISP=SHR //SYSTSPRT DD SYSOUT=A //SYSTSIN DD * input to exec /* //