Question

I have a file that has a name in the first column and count in the second column. It is sorted by name.

    dan 3355
    dan 667
    dan 889
    frank 8
    frank 99
    frank 90
    ian 9

I would like to combine all the same names and output the total count for each name:

    dan 4911
    frank 197
    ian 9

I know that I can use uniq for getting a total count of the identical lines, but how can I preserve the counts that I have in my data?

Answer 1

You can make use of awk’s associative array:

 awk '{arr[$1]+=$2;} END {for (i in arr) print i, arr[i]}' filename