3 files to 1

[kaposznyak]

Hi, i am totally noob in Linux.

My problem is: i have 3 files with 2 colums in each.

1. column is a date, the second one consist a number.

I would like to make a 4. file, with each date in it, whether or not they are in every 3 file, or just in one or two.

The problem is the content of 2. column, the content of which i would like to list in 3 columns. If the date appears in all 3 files, i should have 3 columns with a number in it, if the date misses in 1 file it should say "0".

For example:

File 1.
1. z
2. u
6. p
7. l

File 2.
1. o
3. k
4. h
7. w
10. s

File3.
8. j
10. g


What i need to
see:
1. z.o.0
2. u.0.0
3. 0.k.0
4. 0.h.0
6. p.0.0
7. l.w.0
8. 0.0.j
10. 0.s.g

[kaposznyak]

Thank you in advance!