awk split columns after matching on rows and summing the last column

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# 1  
Old 09-12-2014
awk split columns after matching on rows and summing the last column

chr1	1	2	3
chr1	1	2	4
chr1	2	4	5
chr2	3	6	9
chr2	3	6	10

awk '{a[$1$2$3]+=$4}END{for (i in a) print i,a[i]}' input

chr112 7
chr236 19
chr124 5

Desired output:
chr1 1 2 7
chr2 3 6 19
chr1 2 4 5

Thank you
# 2  
Old 09-12-2014
Add FS (blank space by default)
awk '{a[$1 FS $2 FS $3]+=$4}END{for (i in a) print i,a[i]}'

These 2 Users Gave Thanks to Yoda For This Post:
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