Merge the content of 2files line by line& put the output in another file

               #/bin/bash
                lineCount=`cat $1 | wc -l`
                for i in `seq 1 $lineCount`
                do
                      lineTime=`head -$i $1 | tail -1  | cut -d"," -f1`
                      lineValue=`head -$i $1 | tail -1  | cut -d"," -f2`
                      lineValue2=`head -$i $2 | tail -1  | cut -d"," -f2`
                      result=$(($lineValue + $lineValue2))
                      echo "$lineTime,$result" >> output.csv
                  done
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