Shell Programming and Scripting

for i in `cut -d, -f1 file_name | sort -u`; do sort -rk2 file_name | grep -m1 $i; done

kamaraj@kamaraj-laptop:~/Desktop/Scripts$ cat interchange 
file1.h, 2.0
file2.c, 3.1
file1.h, 2.5
file3.c, 3.3.3
file1.h, 1.2.3
kamaraj@kamaraj-laptop:~/Desktop/Scripts$ for i in `cut -d, -f1 interchange | sort -u`; do sort -rk2 interchange | grep -m1 $i; done
file1.h, 2.5
file2.c, 3.1
file3.c, 3.3.3

 awk '{x=$2;gsub("\\.","",x);for (i=1;i<=(3-length(x));i++){x=x"0"};if (a[$1]<x){a[$1]=x;b[$1]=$0}}END{for (i in b){print b[i]}}' file.csv

 
#!/bin/sh
REPEATED_FILES=`cut -f1 -d, test_version_file | sort | uniq -d`
for repeat in $REPEATED_FILES
do
grep "$repeat" test_version_file | sort -rk2 | awk -F, '{if($2 > val) {val=$2;print $0;}}'
done