adding up field columns in a file

Hello,
I have a file with some columns of numeric data e.g.

5 5
5 6
5 7

I need to total them, currently im using the following method


for i in cat <filename> | awk print column2 (for example)
do
total=$i
total=èxpr $total + $i`
done

However this method is really slow on large files, could someone
recommend a quicker way?

Thanks

.

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