MySQL : Calculate Query Executed per second

Here is a way to calculate Query Executed per second :

time=10
begin=`mysql -e "show status" | awk '{if ($1 == "Questions") print $2}'`
sleep $time
end=`mysql -e "show status" | awk '{if ($1 == "Questions") print $2}'`
diff=`expr $end - $begin`
avg=`expr $diff / $time`
echo "$avg"