In RPG IV, to issue a command, you can use code like this. There's no need to figure out the length of the command before issuing it.
(Good luck with the code formatting...)
* Prototype of QCMDEXC
D RunSysCmd PR EXTPGM('QCMDEXC')
D cmd 200A OPTIONS(*VARSIZE) CONST
D cmdlen 15P 5 CONST
* Issue the Command
C EVAL CmdData = 'WRKACTJOB'
C CALLP(E) RunSysCmd(CmdData: %size(CmdData))
C IF %Error = *On
C EVAL DspData = 'WRKACTJOB failed'
C DspData DSPLY
C ENDIF
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