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Printing highest value from one column

 
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# 1  
Old 05-28-2009
Printing highest value from one column
Hi,

I have a file that looks like this:

s6 98
s6 91
s6 56
s5 32
s5 10
s5 4

So what I want to do is print only the highest value for each value in the column:

So the file will look like this:

s6 98
s5 32

Thanks

Phil
# 2  
Old 05-28-2009
what have you got?
# 3  
Old 05-28-2009
well if the second column is sorted then this will work

awk '!x[$1]++' file name
# 4  
Old 05-28-2009
I have put your values into a test file, a.txt

cat a.txt

s6 98
s6 91
s6 56
s5 32
s5 10
s5 4

The following gives you what you want:

sort a.txt | awk 'BEGIN {x="";y=0;cnt=0;}{if (x != $1) {if (cnt > 0) {print x" "y};cnt=cnt+1;x=$1;y=$2};if (y<$2) {y=$2}}END{print x" "y}'

s5 32
s6 98
# 5  
Old 05-28-2009
Not necessary to sort the file:

Code:
awk 'a[$1] < $2{a[$1]=$2} END{for(i in a){print i, a[i]}}' file

Regards
 
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