How to add values in a variable in Unix shell scripting?

Question

I have two variables called count1 and count7

count7=0
count7=$(($count7 + $count1))

This shows an error \"expression is not complete; more tok

Answer 1

Here's a simple example to add two variables:

var1=4
var2=3
let var3=$var1+$var2
echo $var3