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Please use and tags around any posted code.

Is this what you are after:

for a in {1..100}
do
awk '{ sum+=$a} END {print sum}' a=$a file1
done > file2

or

awk '{for(i=1;i<=100;i++)...

Not sure what you're looking for...can you be more clear about your requirements...

Not sure either. To just get the last column en put it in three columns, try:
awk '{print $NF}' file | pr -s -t3