Question

How to make bash script to take input (numbers) from user and then calculating SUM, AVERAGE of those numbers..??

Answer 1

this small script may do the thing for you.

#!/bin/bash
n='0'
s='0'
c='0'
while [ $n != "x" ]
do
    s=$(( $n+$s ))
    c=$(( $c+1 ))
    echo -n "give number pls [ENTER] (Press 'x' to exit and see result):";
    read n;
done
echo "SUM:$s"
echo "AVG:$(( $s/($c-1) ))"

execution and output:

kent$  bash math.sh
give number pls [ENTER] (Press 'x' to exit and see result):7
give number pls [ENTER] (Press 'x' to exit and see result):8
give number pls [ENTER] (Press 'x' to exit and see result):9
give number pls [ENTER] (Press 'x' to exit and see result):x
SUM:24
AVG:8