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Calculation in Multiple files using awk

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# 8  
Old 08-09-2010
In your sample files, there are some hide spaces (guess you typed them carelessly), that's why it makes a little complex in Christoph Spohr's code.

Below command should be simple, and maybe works with your real data files.
Code:
awk -F , '{a[$2 FS $3 FS $4]+=$1}END{for (i in a) print a[i],i}' sample*.csv

# 9  
Old 08-12-2010
Hi,

Now is it possible to check whether array index has a value in it or empty.

In the code given below,

Code:
awk -F , '{a[$2 FS $3 FS $4]+=$1}END{for (i in a) print a[i],i}' sample*.csv

I want to check whether index $2 FS $3 FS $4 is already having value or present, before summing another value to it.

Is this possible in awk?

---------- Post updated at 11:35 AM ---------- Previous update was at 09:09 AM ----------

Hi,

I have got a option to test for the index in nawk like,

Code:
if ($2","$3","$4 in a)

which checks for the existence of index in array.

Do we have something similar in awk?
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