Shell command to sum integers, one per line?

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I am looking for a command that will
accept (as input) multiple lines of text, each line containing a single integer, and
output the sum of these integers.

As a bit of
background, I have a log file which includes timing measurements. Through grepping for
the relevant lines and a bit of sed reformatting I can list all
of the timings in that file. I would like to work out the total. I can pipe this
intermediate output to any command in order to do the final sum. I have always used
expr in the past, but unless it runs in RPN mode I do not think
it is going to cope with this (and even then it would be
tricky).

How can I get the summation of
integers?

Answer

Bit of awk should do it?

awk '{s+=$1} END
            {print s}'
            mydatafile

Note: some
versions of awk have some odd behaviours if you are going to be adding anything
exceeding 2^31 (2147483647). See comments for more background. One suggestion is to use
printf rather than
print:

awk
            '{s+=$1} END {printf "%.0f", s}'
            mydatafile