what is the related cl program

If I understand your question RUNBRSCHED will run a Report Broker schedule that has been established.

There are 2 CL commands related to scheduling. One is RUNWQFEX which is an alternative method to the GUI scheduler. The other, as David mentions, RUNBRSCHED is to be able to run an already defined "schedule" created via the GUI. You can refer to the wiki at http://ibm.biz/db2wqwiki -> documentation link and look for the runwqfex doc and perhaps peruse the product manual as well.

I believe RUNWQFEX is probably used more (of the 2 CL commands) to run reports off your IBM i job scheduler when you want to control the placement of that output to the IFS or a network drive.