Summing values in columns


 
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# 1  
Old 08-12-2011
Summing values in columns

Basically I have to process a text file which has been sorted this way:

John 12
John 13
John 10
John 900
Peter 20
Peter 30
Peter 32

The first column is a name, and the second an arbitrary value, both delimited by a space. How can I sum them up such that it would become:

John 935
Peter 82

Preferably, this should be done in awk. I have actually written a simple function in bash to do that but it was horribly inefficient:

Code:
while read rec; do
        name=`echo $rec | cut -f1 -d" "`
	value=`echo $rec | cut -f2 -d" "`
	if [ "$name" = "$old_name" ]; then
		let "total=total+value"
        #for the first iteration, we have no old_name to print
	elif [ "$old_name" = "" ]; then
		total=$bytes
		old_IP=$next_IP
	else
		echo "$old_IP $total"
		total=$bytes
		old_IP=$next_IP
	fi
done < textfile

Thank you in advance.
# 2  
Old 08-12-2011
Tools Summing Values in column

Hi,

Code:
nawk 'BEGIN{FS=" ";}{if( a[$1] ){a[$1]=a[$1]+$2;}else{a[$1]=$2;}}END{for ( i in a ){print i" "a[i];}}'  your_input_file


Cheers,
RangaSmilie
# 3  
Old 08-12-2011
Alternate awk..
Code:
awk '{a[$1]+=$2} END{for(i in a) print i,a[i]}' inputfile

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