How to sum numbers with linux

Question

I do a cat results.txt | grep eval and I get

eval: -2.72907
baseline eval (random): -0.031584202184
eval: 0.807805
baseline eval (random): 0.0227601966463
eval: 2.0625
baseline eval (random): 0.0138953249621

How do I sum eval and baseline eval separately with linux commands from the command line?

Have you got bc installed? It's a calculator in itself, it'd probably be easier to use that than bash. — Rup
– Rup, Commented May 15, 2013 at 22:56
possible duplicate of Bash command to sum a column of numbers — dev-null-dweller
– dev-null-dweller, Commented May 15, 2013 at 22:57

johnsyweb · Accepted Answer · 2013-05-15 23:10:51Z

6

Awk can do it

% grep eval results.txt | awk -F: '{a[$1]+=$2}END{for(i in a)print i ": " a[i]}'
eval: 0.141235
baseline eval (random): 0.00507132

Better yet, as Johnsyweb mentioned in a comment, let awk do the searching too:

awk -F: '/eval/{a[$1]+=$2}END{for(i in a)print i ": " a[i]}' results.txt

edited May 15, 2013 at 23:10

johnsyweb

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answered May 15, 2013 at 23:01

Kevin

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4 Comments

Kent Over a year ago

well when I see your answer, I realize that, either you or me, have misunderstood the question... sum eval and baseline eval separately... I may be wrong...

johnsyweb Over a year ago

awk -F: '/eval/ {a[$1]+=$2}END{for(i in a)print i ": " a[i]}' results.txt , surely!?

johnsyweb Over a year ago

@Kent: This does sum the two separately.

Kent Over a year ago

@Johnsyweb I know what the awk line does. I understood the Q as sum(eval and baseline eval) separately... I could be on the wrong way... :(

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