How to find out which user issue the MQ command?

(1) enable qmgr command event
     alter qmgr cmdev(enabled)

(2) the command event will be put into SYSTEM.ADMIN.COMMAND.EVENT queue

(3) use MH05 SupportPac to parse the command events or

(4) use MS0P SupportPac to format the command events in MQ Explorer

command events
https://www.ibm.com/support/knowledgecenter/SSFKSJ_7.1.0/com.ibm.mq.doc/mo11290_.htm

MH05: WebSphere MQ - Events Display Tool
http://www-01.ibm.com/support/docview.wss?uid=swg24029241

MS0P: WMQ explorer plugin
http://www-01.ibm.com/support/docview.wss?uid=swg24011617