我有一份文件。它包含如下字段
i/p文件:
a.txt
9842,5003,a,a,100
9942,5003,a,a,100
9852,5003,a,a,100
98456,5003,a,a,100
9742,5003,a,a,100
b.txt
7842,5003,a,a,100
7942,5003,a,a,100
7852,5003,a,a,100
98456,5003,a,a,100
7742,5003,a,a,100
c.txt
8842,5003,a,a,100
9842,5003,a,a,100
8852,5003,a,a,100
88456,5003,a,a,100
874