Adding up numbers in a file

From: adamsalisbury@xxxxxxxxx
Date: 15 Feb 2006 07:58:53 -0800

Hi,
In a shell how would I add up a set of numbers in a file.
For example if I had a file holding...

filename
------------
10
15
7
2

How would I derive the total of those numbers, 34?

Thanks
Adam.

.

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