Moving Avg. (Rolling Mean) Bash Demo.

rolling_mean.sh

#!/bin/bash

function gendata(){
for i in `seq 1 $1`
do
        echo $(( ( RANDOM % $2 )  + 1 )) >> data_$$
done
}

echo '##Generate Datas##'
gendata 5 10
cat data_$$

echo '##Calculate Rolling Avg.##'
amount=0
count=0
while read line
do
        amount=$(($amount + $line))
        count=$(($count + 1))
        python -c "print $amount/$count.0"
done < data_$$

rm data_$$