Hi all
I have 3 three files like:
file1:

1|100
2|200
3|300
4|400
5|500

file2:
1|200
2|200
3|600
4|800


file3:
1|300
2|100
3|200


i would like out put file like:
1|100|200|300|0
2|200|200|100|100
3|300|600|200|700
4|400|800|0|1200


senario:

i wolud like

file1.column2+file2.cloumn2-file3.cloumn2

please help me on this.