I've ever wonder why there isn't a command in linux (debian and related distros) that instead of having to create an alias for a command like:

```
sudo apt-get update; sudo apt-get upgrade

```

why not upgrade would do those two tasks at once? 

I understand that sometimes you just want to update the sources but why Linux doesn't have a command that does that at once so nobody would have to type a long line every time they want to update and upgrade their applications.