Sum duplicate row values with awk

Question

I have a file with the following structure:

1486113768 3656
1486113768 6280
1486113769 530912
1486113769 5629824
1486113770 5122176
1486113772 3565920
148611         


        

Answer 1

Say you have a top ten lines from many log files output concatened in one file (and sorted with 'sort') with that kind of results :

   2142 /pathtofile1/00.jpg
   2173 /pathtofile1/00.jpg
   2100 /pathtofile1/00.jpg
   2127 /pathtofile1/00.jpg

you can also change the order of sum:

$ awk '{ seen[$2] += $1 } END { for (i in seen) print i, seen[i] }' top10s.txt | sort -k 2 -rn

and you'll get that total:

/pathtofile1/00.jpg 8542