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

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2021-11-07 16:54:06 +01:00
## Sum
### Objectives
1. Write a script that gets two numbers and prints their sum
3. Make sure the input is valid (= you got two numbers from the user)
2. 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
```