Hey ! you can use
dsjob -lstages PRJCT_NAME Jobname
This will give all the stages in that particular job.
Now use the following comman:
dsjob -stageinfo PRJCT_NAME Jobname Src_stage_name > some.txt
From these grep for In Rows and you will get the source row count.
Same thing for the target.
dsjob -stageinfo PRJCT_NAME Jobname Tgt_stage_name >> some.txt