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awk group by

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# 1  
Old 05-19-2009
Hammer & Screwdriver awk group by
Hi
I have a file in this format:
...
04/May/2009 16
04/May/2009 1
05/May/2009 3
05/May/2009 5
06/May/2009 1
06/May/2009 3
...

I need to sum for every day, What is the best way?
Thanks all
# 2  
Old 05-19-2009
Use gawk, nawk or /usr/xpg4/bin/awk on Solaris.

Code:
awk 'END{for(d in _)print d, _[d]}{_[$1]+=$2}' infile

# 3  
Old 05-19-2009
Code:
 awk '{a[$1]=a[$1]+$2}END{for(i in a)print i,a[i]}' file



-Devaraj Takhellambam
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