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Try this ,
sort -t"," -k1,1 -k3,3nr Filename | awk -F"," '!a[$1]++'

Hi,
Try this one,

awk 'BEGIN{FS=",";}{if(a[$1]<$3){a[$1]=$3;}}END{for(i in a){print i","a[i];}}' file|sort -t',' -k1,1

if you are using gawk, make you of asort function to sort the array a and...