### Running Sage in command-line

I know how to run a sage function in command-line:

```
[liuzw@ln01 ~]$ sage -c 'print(1+1)'
2
[liuzw@ln01 ~]
```

I know how to attach a code in command-line:

```
[liuzw@ln01 ~]$ sage fusion2.spyx
Compiling fusion2.spyx...
[liuzw@ln01 ~]$
```

But I don't know how to run a sage function after having attached a code:

```
[liuzw@ln01 ~]$ sage fusion2.spyx -c 'print(1+1)'
Compiling fusion2.spyx...
[liuzw@ln01 ~]$
```

Of course here `print(1+1)`

is a trivial function to show an easy example.

Usually I need to use a function defined in the file `fusion2.spyx`

.

**Question**: How to do this last step?