grep "DTD HTML 4.01" history_data/* | awk -F':' '{print $1}' | xargs rm -f while read line ; do head -6 history_data/$line | tail -5 > recent_data/$line; done < history_data/code while read line ; do awk -F',' 'BEGIN{max=0;}{if ($4<min){min=$4;}if ($3>max){max=$3;}}END{print max, min;}' recent_data/$line >> recent_data/$line; done < history_data/code