1BEGIN {
2  FS="\t";
3}
4{
5  dyn[$2] += $1;
6  stat[$2]++;
7  files[$2] += (FILENAME!=filename[$2]);
8  filename[$2] = FILENAME;
9}
10END {
11  for (i in dyn)
12    printf("%7d\t%7d\t%15d\t%s\n",files[i],stat[i],dyn[i],i);
13}
14