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thanks a lot, i got it

in fact what i want to do is:
i have 8 files, each have 5 column data
i want to merge these files into 1 file,
so i will get a 1 file with 40 column

using awk, we can read a specific column of a file.
is it possible to write to a specific column of a file too?
and how? (if possible)