CUR_TIME=`echo "select mark, SUM(TIME_TO_SEC(time)) from bench where mark = \"$MARK\" group by mark;" | mysql -u helm -h mowgli.cs.unibo.it matita | tail -n 1 | awk '{print $2}'`
OLD_TIME=`echo "select mark, SUM(TIME_TO_SEC(time)) from bench where mark = \"$LASTMARK\" group by mark;" | mysql -u helm -h mowgli.cs.unibo.it matita | tail -n 1 | awk '{print $2}'`
CUR_TIME=`echo "select mark, SUM(TIME_TO_SEC(time)) from bench where mark = \"$MARK\" group by mark;" | mysql -u helm -h mowgli.cs.unibo.it matita | tail -n 1 | awk '{print $2}'`
OLD_TIME=`echo "select mark, SUM(TIME_TO_SEC(time)) from bench where mark = \"$LASTMARK\" group by mark;" | mysql -u helm -h mowgli.cs.unibo.it matita | tail -n 1 | awk '{print $2}'`