Choosing between repeated entries based on a column field

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# 1  
Old 09-21-2013
Choosing between repeated entries based on a column field

Hello, I have an input file:
LOC_Os04g01890\LOC_Os05g17604    0.051307       
LOC_Os04g01890\LOC_Os05g17604    0.150977       
LOC_Os04g01890\LOC_Os05g17604    0.306231      
LOC_Os04g01890\LOC_Os06g33100    0.168037       
LOC_Os04g01890\LOC_Os06g33100    0.236293       
LOC_Os04g01890\LOC_Os07g03590    0.109948      
LOC_Os04g01890\LOC_Os07g03590    0.12325

I want to select the largest of each repeated entries based on Column 2
Desired output:

      LOC_Os04g01890\LOC_Os05g17604    0.306231       
      LOC_Os04g01890\LOC_Os06g33100    0.236293       
      LOC_Os04g01890\LOC_Os07g03590    0.12325

Wanted to know a shell command which can do this. Thanks

Last edited by Franklin52; 09-23-2013 at 03:42 AM.. Reason: Fixed code tags
# 2  
Old 09-21-2013
Using awk:
awk '{if(A[$1]<$2||!(A[$1])) A[$1]=$2}END{for(k in A) print k,A[k]}' file

This User Gave Thanks to Yoda For This Post:
# 3  
Old 09-21-2013
If order of the output does not matter:
perl -lane '$max{$F[0]} = $F[1] unless exists $max{$F[0]}; $max{$F[0]} = $F[1] if $F[1] > $max{$F[0]};
END{ print "$_ $max{$_}" for keys %max}' file

# 4  
Old 09-21-2013
With sort:
sort -k2,2 -rn file | sort -k1,1 -u

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