devops-exercises/exercises/shell/solutions/sum.md

Sum

Objectives

1. Write a script that gets two numbers and prints their sum
2. Make sure the input is valid (= you got two numbers from the user)
3. Test the script by running and passing it two numbers as arguments

Constraints

1. Use functions

Solution

#!/usr/bin/env bash

re='^[0-9]+$'

if ! [[ $1 =~ $re && $2 =~ $re ]]; then
    echo "Oh no...I need two numbers"
    exit 2
fi

function sum {
    echo $(( $1 + $2 ))
}

sum $1 $2