Shell Programming and Scripting

while read rec; do
        name=`echo $rec | cut -f1 -d" "`
	value=`echo $rec | cut -f2 -d" "`
	if [ "$name" = "$old_name" ]; then
		let "total=total+value"
        #for the first iteration, we have no old_name to print
	elif [ "$old_name" = "" ]; then
		total=$bytes
		old_IP=$next_IP
	else
		echo "$old_IP $total"
		total=$bytes
		old_IP=$next_IP
	fi
done < textfile

nawk 'BEGIN{FS=" ";}{if( a[$1] ){a[$1]=a[$1]+$2;}else{a[$1]=$2;}}END{for ( i in a ){print i" "a[i];}}'  your_input_file

awk '{a[$1]+=$2} END{for(i in a) print i,a[i]}' inputfile