Shell Script to Add Two Integers

Brief: This example will help you to understand to add two numbers in the bash script. This script takes the input of two numbers from the user and prints the sum of both numbers.

This sample script initializes two variables with numeric values. Then add two number variables and store in another variable.

#!/bin/bash
 
a=10
b=20

sum=$((a+b))

echo $sum

#!/bin/bash

a=10

b=20

sum=$((a+b))

echo $sum

The below shell script uses read command to prompt the user for two numbers. Then calculate the sum of given numbers and store to another variable.

#!/bin/bash
 
read -p "Enter first number: " num1
read -p "Enter second number: " num2

sum=$((num1+num2))

echo "Sum is: $sum"

#!/bin/bash

read -p "Enter first number: " num1

read -p "Enter second number: " num2

sum=$((num1+num2))

echo "Sum is: $sum"

Output:

Enter first number: 12
Enter second number: 14
Sum is: 26

bash, script, shell, shell script