Shell Programming and Scripting

10 name1 ID1 value1 value2 valueN..
31 name2 ID1 value1 value2 valueN..
20 name3 ID2 value1 value2 valueN..
23 name4 ID2 value1 value2 valueN..
33 name5 ID2 value1 value2 valueN..
45 name6 ID2 value1 value2 valueN..

31 name2 ID1 value1 value2 valueN..
45 name6 ID2 value1 value2 valueN..

awk 'FNR==NR{X[$3]=X[$3]>$1?X[$3]:$1;next} {D[$3 OFS $1]=$0} END{for(i in X){print D[i OFS X[i]]}}'  Input_file Input_file

awk 'FNR==NR{
                X[$3]=X[$3]>$1?X[$3]:$1;
                next
            }
            {
                D[$3 OFS $1]=$0
            }
     END    {
                for(i in X){
                                print D[i OFS X[i]]
                           }
            }
    '  Input_file Input_file

awk '($1>max[$3]) {max[$3]=$1; s[$3]=$0} END {for (i in s) print s[i]}' file

awk 'FNR==NR{
                X[$3]=X[$3]>$1?X[$3]:$1;
                next
            }
        (X[$3]==$1)
    '  Input_file Input_file