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Here is the code that I use now:

paste $filein1 $filein2 | nawk ' BEGIN {begdata=0}{
if ((NR>2 && NF==12) || begdata==1) {
for(i=1;i<=NF/2;i++) {
...

Of course, I am on it. Thanks again.

Thanks a lot, I am very impress, really!
It works very well for my example but indeed I have forgot to say that
-each line start with 1 or more whitespace
-first value can be negative so first...

Hi Everyone !

I have two files with the same configuration
and I want to multiply corresponding values and write the result in a file.
Let say 2 header lines and then lines of values (with not...