Code snippets for defining or altering Message Queues through JCL
Here I am changing INITQ for Local Queue PK01.
//PRODSTEP
EXEC PGM=CSQUTIL,PARM='QueueManger Name'
//SYSPRINT
DD SYSOUT=*
//STEPLIB
DD DSN=MQM.SCSQLOAD,DISP=SHR
//SYSIN
DD *