[Work] Shell script -- calculate sum and mean

#!/bin/bash
sum=0.0
line=0
count=0

for i in `awk '{printf("%12.7f ",$1)}' $1`
do 
  line=$(( $line+1 ))
  if [ $line -ge 200 -a $line -lt 600 ]
  then
    a=`echo $sum+$i | bc -l`
    sum=$a
    count=$(( $count + 1 ))
  fi
done

echo sum   = $sum
echo count = $count
a=`echo $sum/$count | bc -l`
echo mean  = $a

exit 1


--------------------
simply select lines

#!/bin/bash

line=0
count=0

for i in `awk '{printf("%12.7f ",$1)}' $1` 
do 
  line=$(( $line+1 ))
  if [ $line -ge $2 -a $line -lt $3 ]
  then
    echo $i
  fi
done

exit 1