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How to sum column 1 values

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# 1  
Old 06-28-2008
Question How to sum column 1 values
I have a file file like this. I want to sum all column 1 values.

input
A 2
A 3
A 4
B 4
B 2

Out put
A 9
B 6
# 2  
Old 06-28-2008
Code:
awk '{ arr[$1]+=$2 } END {for (i in arr) {print i,arr[i]}   } ' file

# 3  
Old 06-28-2008
Thanks
Thanks a lot it is working...
# 4  
Old 07-01-2008
Quote:
Originally Posted by jim mcnamara
Code:
awk '{ arr[$1]+=$2 } END {for (i in arr) {print i,arr[i]}   } ' file


Jim,
can you explain what this means
awk '{ arr[$1]+=$2 }

Thanks
Namish
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