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"