Shell Programming and Scripting

a 1 4
b 2 5
c 3 6

a 1 4
b 2 5
c 3 6
Max 3 6
Min 1 4
Diff 2 2

awk 'min=="" || $2 < min {min=$2} END{print min}' file.txt

awk '{
        for(N=2; N<=NF; N++) { 
                if((!MIN[N])||(MIN[N]>$N)) MIN[N]=$N
                if((!MAX[N])||(MAX[N]<$N)) MAX[N]=$N }
        END {
                printf("MIN");
                for(N=2; length(MIN[N]); N++)
                        printf("\t%s", MIN[N]);
                printf("\n");
                printf("MAX");
                for(N=2; length(MIN[N]); N++)
                        printf("\t%s", MAX[N]);
                printf("\n");
                printf("DIFF");
                for(N=2; length(MIN[N]); N++)
                        printf("\t%s", MAX[N]-MIN[N]);
                printf("\n");
        }' filename

awk '
{
   for (i=2;i<=NF;i++) {
      if (i in min) {
         if ($i < min[i]) {
            min[i]=$i;
         }
      } else {
         min[i]=$i;
      }
      if (i in max) {
        ...etc...
   }
}1
END {
   printf ("Min: ");
   for (i in min) {
      printf ("%d ", min[i])
   }
   printf ("\n");
  etc...
}

NR>1 {
    for stuff