1 #!/bin/bash 2 3 len=0 4 total=0 5 while read -r num 6 do 7 len=$(( $len + 1 )) 8 total=$(( $total + $num )) 9 done < input.txt 10 11 echo "length is $len and total is $total" 12 avg=$(( $total / $len )) 13 14 echo "Average is $avg"