Shell Programming and Scripting

$ cat cartons
a-10.txt:number of eggs used is 55 in 4 cartons
a-4.txt:number of eggs used is 97 in 3 cartons
a-6.txt:number of eggs used is 22 in 1 cartons
a-8.txt:number of eggs used is 44 in 9 cartons
b-10.txt:number of eggs used is 87 in 5 cartons
b-4.txt:number of eggs used is 85 in 5 cartons
b-6.txt:number of eggs used is 36 in 6 cartons
b-8.txt:number of eggs used is 88 in 2 cartons

$ awk ' {if ($1~/^a/) {eggA+=$6;cartonsA+=$8}}; {if ($1~/^b/) {eggB+=$6;cartonsB+=$8}} END {print eggA, "eggs and " ,cartonsA, "cartons in a files, average is " eggA/cartonsA , "\n"  eggB,"eggs and ", cartonsB " cartons in b files, average is " eggB/cartonsB}' cartons
218 eggs and  17 cartons in a files, average is 12.8235
296 eggs and  18 cartons in b files, average is 16.4444

#!/bin/bash
grep -h cartons [ab]-* |
{ while read eggs x x cartons x; do
    (( total_eggs+=eggs ))
    (( total_cartons+=cartons ));
  done
  printf '%s %.2F %s\n' "A total number of $total_eggs eggs in $total_cartons cartons makes an average of" $(echo "$total_eggs/$total_cartons"|bc -l) "eggs per carton"
}

#!/bin/ksh
grep -h cartons [ab]-*|
while read eggs x x cartons x; do
  (( total_eggs+=eggs ))
  (( total_cartons+=cartons ))
done
printf '%s %.2F %s\n' "A total number of $total_eggs eggs in $total_cartons cartons makes an average of" $(( total_eggs/$total_cartons.0 )) "eggs per carton"

A total number of 514 eggs in 35 cartons makes an average of 14.69 eggs per carton