Start extracting author line from /root/tools/ChangeLog-2.6.13...
Restored the author line to file ./tmp_author.

./patch_sta /root/tools/ChangeLog-2.6.13 -l 2
Total patches of this release: 3901
Averagely, every person commited 6 patches
We have a long tail:
There are 364 people who committed less than 2 patch.
But their contribution is about 11% of total