Shell command to sum integers, one per line?
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, so through grepping for the relevant lines, and a bit of sed reformatting I can list all of the timings in that file. I'd like to work out the total however, and my mind has gone blank as to any command I can pipe this intermediate output to in order to do the final sum. I've always used expr in the past, but unless it runs in RPN mode I don't think it's going to cope with this (and even then it would be tricky).
What am I missing? Given that there are probably several ways to achieve this, I will be happy to read (and upvote ) any approach that works, even if someone else has already posted a different solution that does the job.
Related question: Shortest command to calculate the sum of a column of output on Unix? (credits @Andrew)
Update : Wow, as expected there are some nice answers here. Looks like I will definitely have to give awk deeper inspection as a command-line tool in general!
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
Paste typically merges lines of multiple files, but it can also be used to convert individual lines of a file into a single line. The delimiter flag allows you to pass a x+x type equation to bc.
paste -s -d+ infile | bc
Alternatively, when piping from stdin,
<commands> | paste -s -d+ - | bc
Python中的单行版本：
$ python -c "import sys; print(sum(int(l) for l in sys.stdin))"
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