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## plus
### Instructions
In this exercise, you will make a script `plus.sh` that will take two arguments from the command line, add them and output the result.
### Usage
```console
$ ./plus.sh 2 3
5
$
```
### Hints
Here are some commands that you can combine to find the solution:
- `expr`: this command evaluates an expression and outputs the result.
- `command substitution - $(...)`: this command can be used to interpolate the output of running a command into a string. You can replace the ellipsis with your command.
You could use `expr` like this:
```console
$ expr 2 - 2
0
$
```
And `$(...)` like this:
```console
$ echo "This is the content of a file: $(cat file.txt)"
This is the content of a file: <content of the file>`
$
```
### References
- [expr](https://www.gnu.org/software/coreutils/manual/html_node/expr-invocation.html#expr-invocation).
- [command substitution](https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Command-Substitution).