When a user calls with a problem, if you have a large system with a lot of users, separate storage pools, running WebSphere, etc. it can take time to scroll down to find their job. The IBM command WRKUSERJOB by default shows all jobs on the system owned by that user so, even with using this command, it can take time to find the one job you are looking for.
To get around this I created a copy of WRKUSRJOB into QGPL and called it RUIN (aRe yoU IN �- get it?) and changed the command default to show active jobs only.
CRTDUPOBJ OBJ(WRKUSRJOB) FROMLIB(QSYS) OBJTYPE(CMD) TOLIB(QGPL) NEWOBJ(RUIN) CHGCMDDFT CMD(RUIN) NEWDFT(STATUS(*ACTIVE))